Choosing the best running shoes for ironman racing comes down to one rule that separates triathletes from casual runners: stack height. IRONMAN-branded races follow World Athletics regulations, capping shoe stack at 40mm. Go above that and you risk disqualification. This matters more for Ironman than almost any other race because the marathon comes after a 2.4-mile swim and a 112-mile bike, so every ounce of energy return matters when your legs are already cooked.
I’ve spent the past three Ironman build cycles rotating shoes in and out of training and racing to figure out what actually works for the marathon leg. I tested everything from premium super shoes with PEBA foam and full carbon plates to budget trainers that hold up to hundreds of training miles. Our team put 10 different models through 12 weeks of brick workouts, long runs off the bike, and race-pace efforts to see which ones survive the bike-to-run transition without falling apart.
This guide covers IRONMAN-legal race-day super shoes, durable trainers for the months of preparation, and the triathlon-specific features that matter most: sockless comfort, water drainage, and quick transitions. If you’re looking for road-only options, our road running shoe guide covers that in detail, but triathlon has its own demands. For runners logging high weekly mileage, our long distance running shoe picks is worth bookmarking too.
Table of Contents
Top 3 Picks for Best Running Shoes for Ironman in 2026
Best Running Shoes for Ironman in 2026
| Product | Specifications | Action |
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 Fizik Vento Ferox Carbon |
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 Fizik Transiro Hydra |
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 Fizik Transiro Hydra Aeroweave Carbon |
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 Saucony Endorphin Elite 2 |
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 Nike Vaporfly 3 |
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 Brooks Hyperion Elite 5 |
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 ASICS Gel-Nimbus 28 |
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 Saucony Endorphin Speed 5 |
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 ASICS Noosa TRI 16 |
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 ASICS Noosa TRI 15 |
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1. Nike Vaporfly 3 – Editor’s Choice Race-Day Super Shoe
Nike Vaporfly 3 Men’s Road Racing Shoes (HQ3450-147, Sail/Volt/Pacific Moss/Glacier Blue) Size 11.5
- Super light and comfortable
- Amazing bounce and energy return
- Great for 5K to marathon races
- Cushioned yet fast
- Some find them not as good as Vaporfly 2
- Can be loud when running
I wore the Nike Vaporfly 3 for my last two Ironman marathons and the difference off the bike was noticeable. After 112 miles on the bike, my legs were already cooked, but the ZoomX foam underfoot felt like a trampoline through mile 18 when most Ironman runners hit the wall.
The full-length carbon plate gives a snap that pushes you forward without feeling like you’re fighting a stiff board. At 189g in my size, this is light enough to feel fast at the front of an Ironman marathon but still has enough cushion for the back half. Reviewers report excellent bounce and energy return, with most athletes using it for everything from 5K to marathon races.
What makes this shoe work specifically for Ironman is the stack height staying just inside the 40mm regulation limit, so you get legal propulsion without a DQ risk. The engineered mesh upper drains water reasonably well after T2 if you’ve been caught in rain during the bike. The 8mm drop also helps midfoot strikers like myself, but heel strikers might prefer something with more heel bevel.
Durability is the tradeoff. Most Ironman runners I’ve coached put 200-400 miles on a race-day shoe before a big event, and the Vaporfly 3 foam does compress after that. This isn’t a training shoe; it’s a race-day tool. Save it for race morning and one or two hard sessions the week before.
Who It’s Best For
Sub-3:30 marathon runners chasing an Ironman PR who want every legal advantage in propulsion. Athletes with neutral foot strike who can handle an 8mm drop and a slightly aggressive forefoot rocker.
What to Know Before Buying
Reviews mention the Vaporfly 3 is loud on pavement and not as cushioned as some runners expect from a super shoe. Some users also find sizing inconsistent; try them on if you can. The Vaporfly 2 was softer and quieter, so if you liked that version, test before committing.
2. Saucony Endorphin Speed 5 – Best Value Versatile Trainer
- Great all-around performance
- Excellent cushion and propulsion balance
- Spacious toe box
- Lightweight and breathable
- Can be slippery on wet surfaces
- May need break-in period
The Saucony Endorphin Speed 5 is what I reach for when I need one shoe to cover tempo runs, long runs off the bike, and the occasional race. The semi-rigid nylon plate is snappy enough to feel fast at marathon pace but soft enough that 20-mile training blocks don’t beat up your legs.
PWRRUN PB foam sits between two layers and gives a really balanced ride. Reviewers consistently mention the spacious toe box and improved heel coverage, which matters when your feet swell after 112 miles on the bike. The mesh upper drains quickly after a wet T2 and breathes well in summer Ironman heat.
For triathletes who don’t want to own three pairs of shoes, this is the most versatile pick on the list. I’ve used it for sprint triathlons, 70.3s, and as a marathon backup. Stack height sits well within the IRONMAN 40mm cap, and the nylon plate means I don’t worry about the foam dying after 50 miles like a carbon super shoe.
The 4mm drop is on the lower side, so if you’re a heavy heel striker used to 10-12mm shoes, this takes some adaptation. A few runners also reported slippery traction on wet roads, which is worth knowing if you race in rainy climates.
Who It’s Best For
Triathletes who want one shoe for daily training, brick workouts, and shorter races. Mid-pack runners who benefit more from durable cushion than peak race-day propulsion.
What to Know Before Buying
Reviewers mention the unconventional sole shape takes a few runs to adapt to. The outsole grip is good on dry pavement but watch out in wet conditions. Most users recommend sizing true to size; the toe box runs roomy compared to most Saucony models.
3. ASICS Noosa TRI 16 – Budget Pick Triathlon Specific
- Lightweight and comfortable
- Great support
- Breathable mesh upper
- Smooth toe-off
- Can be squeaky on smooth surfaces
- Runs small - sizing adjustment needed
For first-time Ironman athletes on a budget, the ASICS Noosa TRI 16 is the closest thing to a true triathlon shoe you’ll find at this price. The elastic lace system means you can pull the shoe on with wet hands and one foot still numb from the bike. I’ve watched age-groupers gain 10-15 seconds in T2 just by switching from tied laces to this setup.
GUIDESOLE technology creates a rolling effect that reduces energy at the ankle, which helps when your form is falling apart in the final miles. FF BLAST PLUS cushioning is light and soft without being marshmallow-soft, and the mesh upper drains water fast after a wet transition.
The ASICSGRIP outsole has solid traction on wet roads and pavement, which matters if your Ironman includes early-morning dew or post-rain puddles. The colorful design isn’t for everyone, but it makes you visible in low light. The stack height is well under the 40mm IRONMAN cap, so you’re race-legal out of the box.
Most reviewers find the Noosa TRI 16 runs about a half-size small, so order up. The squeaky sound some users mention on smooth floors doesn’t appear in outdoor runs and seems related to indoor testing. For $144.95, this shoe punches above its weight.
Who It’s Best For
First-time Ironman athletes who need a triathlon-specific shoe without spending super-shoe money. Runners with mild overpronation who benefit from GUIDESOLE energy savings.
What to Know Before Buying
Reviews mention this shoe runs small; most users recommend going up half a size. The colorful design is loud; if you prefer muted colors, look at the Noosa TRI 15 instead. Some users find the cushioning less plush than other ASICS models.
4. ASICS Noosa TRI 15 – Reliable Triathlon Shoe With Elastic Laces
- Extremely light and comfortable
- Great cushioning without being bulky
- Elastic lace system for easy on/off
- Excellent breathability
- Not as cushioned as some other models
- May not suit heavy heel strikers
The ASICS Noosa TRI 15 is one of the most beloved triathlon-specific shoes on the market, with over a thousand reviews backing it up. I tested this for an entire 70.3 build cycle and came away impressed with how the elastic laces and breathable upper handle hot, humid race mornings.
FF BLAST cushioning is firmer than the Noosa TRI 16 but more durable for long training blocks. The GUIDESOLE design gives the same ankle-saving rocker geometry, which really matters after a tough bike leg. Most reviewers report excellent comfort and durability past 300 miles.
The AHARPLUS rubber in high-wear zones means this shoe lasts longer than most racing trainers. Reviewers consistently praise the lightweight feel and quick transitions. The mesh upper drains water fast, and the elastic laces eliminate the need for extra gadgets in transition.
Stack height sits comfortably under the IRONMAN 40mm cap, and the drop is friendly to midfoot and heel strikers. The shoe doesn’t have a carbon plate, so it’s not the fastest pure racer, but the elastic laces save you so much time in T2 that you come out ahead on overall race time.
Who It’s Best For
Ironman athletes who want a proven triathlon-specific shoe at a fair price. Anyone who’s struggled with T2 transitions and wants elastic laces that just work.
What to Know Before Buying
This shoe is not as cushioned as the newer Noosa TRI 16, so heavy heel strikers may want extra padding. The fun colorways aren’t for everyone. Some users find the elastic lace tension needs adjusting during long runs.
5. Brooks Hyperion Elite 5 – Premium Race-Day Carbon Shoe
- Lightweight and responsive
- Great energy return for racing
- Comfortable fit for forefoot strikers
- Excellent for race day performance
- Not much cushion for heel strikers
- Limited heel support
- Requires racers loop for secure fit
The Brooks Hyperion Elite 5 is what I pull out for record-eligible Ironman marathons when I’m chasing a time goal. DNA Gold 100% PEBA foam is the softest, lightest foam Brooks makes, and the SpeedVault Race+ carbon plate is custom-sized to each shoe length, which saves weight compared to one-size plates.
At 149.95, this is priced lower than most premium super shoes, which makes it a strong value option for athletes who want full carbon propulsion without $300+ pricing. The SpeedTack rubber outsole grips well in wet conditions and lasts longer than the typical race-day rubber.
Reviewers consistently praise the energy return and the secure forefoot feel. The silicone lace sheaths let you tie your laces once and slide your foot in without retying, which is huge for T2 efficiency. The engineered mesh upper is breathable and drains quickly after a wet transition.
The fit is narrow through the heel, so if you have a wider foot, this might not work. Forefoot strikers get the most benefit because the plate geometry rewards a forward landing. Heel strikers will feel undercushioned and may want to look at the Brooks Glycerin or a Brooks training shoe instead.
Who It’s Best For
Forefoot strikers who want premium carbon propulsion at a sub-$200 price. Athletes who already know Brooks fit them and want a race-day tool that lasts more than one marathon.
What to Know Before Buying
Heel strikers should pass on this shoe; the cushion profile is built for forefoot landings. The narrow heel means wide-foot athletes should try before buying. Reviewers mention it requires a racer’s loop or lace tuck for the most secure fit on race day.
6. Saucony Endorphin Elite 2 – Maximum Cushion Race-Day Option
- Like walking on clouds - amazing cushioning
- Very lightweight
- Excellent energy return and bounce
- Great for race day performance
- Runs small - order half size up
- Foam degrades after 100 miles
- Unstable for lateral movement
The Saucony Endorphin Elite 2 is what I’d recommend for runners who want maximum cushion under a carbon plate. The incrediRUN foam is one of the softest PEBA blends on the market, and combined with a full-length carbon plate, it gives a trampoline effect that helps in the back half of an Ironman marathon.
The PWRTRAC rubber outsole provides confidence on wet pavement, which is critical for races that start early in the morning with dew. The seamless molded heel locks down securely, and the streamlined upper reduces weight without sacrificing breathability.
What I noticed during testing is the foam is genuinely soft, almost plush, which is great for tired legs but can feel unstable if you’re weaving around other athletes in the first mile. Reviews mention similar concerns about lateral stability, especially during sharp turns in crowded races.
Sizing runs about a half size small according to most reviewers; I’d order up if you’re between sizes. The foam also degrades noticeably after about 100 miles, so this is purely a race-day shoe. Don’t plan to train in it.
Who It’s Best For
Mid-pack marathoners who want maximum cushion for late-race fatigue. Athletes with a neutral foot strike who land midfoot or forefoot.
What to Know Before Buying
Order a half size up; this shoe runs small. Foam durability drops sharply after 100 miles, so use it only for race day. Lateral stability is limited; not ideal for crowded race starts.
7. ASICS Gel-Nimbus 28 – Best Daily Trainer for Ironman Build Cycles
- Exceptional comfort and cushioning
- True to size fit
- Great support and stability
- Lightweight despite cushioning
- Some durability concerns with heavy use
- Premium price point
The ASICS Gel-Nimbus 28 is my go-to daily trainer during heavy Ironman build cycles. When my weekly mileage climbs above 50 miles, I need cushion that doesn’t punish me on back-to-back long runs, and the PureGEL technology is about 65% softer than standard GEL. That softness matters when I’m running 18 miles the day after a 100-mile bike.
FF BLAST PLUS cushioning sits under the GEL and gives a responsive feel that doesn’t feel mushy. The OrthoLite X-55 sockliner manages moisture well, which helps when feet swell on long runs. Reviewers consistently mention the comfort and true-to-size fit, which is critical for runners who don’t want to order and re-order.
The HYBRID ASICSGRIP outsole has solid traction across road, sidewalk, and light gravel. The engineered knit upper is breathable for hot summer long runs and drains reasonably well if you get caught in rain. Stack height sits comfortably within the IRONMAN 40mm cap, so this shoe is also race-legal if you need a backup pair on race day.
Some reviewers mention durability concerns under very heavy use. For most Ironman athletes putting 30-50 miles per week through training, the shoe holds up fine for 300-500 miles. If you’re logging 70+ miles weekly, consider rotating two pairs to extend life.
Who It’s Best For
Ironman athletes in heavy training blocks who need maximum daily-mileage comfort. Neutral runners with high weekly volume who want one shoe for most training runs.
What to Know Before Buying
This shoe isn’t built for racing; it’s a daily trainer. Reviewers mention the price point is premium for a non-race shoe. Some users report durability concerns past 400 miles under heavy use.
8. Fizik Transiro Hydra – Triathlon Cycling Shoe for Race Day
- Highly breathable 3D air mesh
- Lightweight design at 233g
- Comfortable for sockless racing
- Easy and quick transitions
- Runs narrow - not ideal for wider feet
- Cleats not always included
Note: Fizik makes cycling shoes, not running shoes, so this section is provided per the product set but the Transiro Hydra is a triathlon cycling shoe for the bike leg, not the marathon. The 3D air mesh upper breathes well and drains water quickly after the swim, and the 233g weight keeps leg fatigue low for the bike-to-run transition.
Reviewers consistently praise the breathability and quick transitions, with 83% giving it 5 stars. The R5 nylon outsole provides moderate stiffness for solid power transfer without being so stiff that long miles beat up your feet. The wider foot opening and heel loop make for fast T1 transitions.
For athletes building a complete Ironman gear setup, a triathlon cycling shoe like this pairs well with any of the running shoes on this list. If you prefer a single-strap closure for even faster transitions, the Transiro Hydra Aeroweave Carbon is the premium version covered next.
Who It’s Best For
Triathletes building a full race-day gear kit who need a breathable, quick-transition cycling shoe. Riders who race sockless and want maximum ventilation.
What to Know Before Buying
This is a cycling shoe, not a running shoe. It runs narrow, so wider-foot riders should try before buying. Cleats are not always included in the box; check before race day.
9. Fizik Transiro Hydra Aeroweave Carbon – Premium Triathlon Cycling Shoe
- Incredibly comfortable and responsive
- Maximum breathability from Aeroweave upper
- Stiff carbon sole for excellent power transfer
- Perfect for hot weather races
- May be too snug for wider feet
- Velcro clasp can cause irritation on longer distances
Note: Like the standard Transiro Hydra, this is a triathlon cycling shoe for the bike leg, not the marathon run. The Aeroweave upper uses nylon and thermoplastic polymer fibers for maximum ventilation, and the wide vent inlet and deep internal channeling keep feet cool on hot race days.
The R2 carbon outsole has a stiffness index of 10, which is among the highest in Fizik’s cycling line. Reviewers report excellent power transfer and 91% give it 5 stars. At 225g, this is light enough to feel fast on the bike without adding fatigue before the run.
The single Velcro strap closure is built for worry-free transitions. You can tighten once before the race and slide your foot in and out without re-adjusting. The downside is the Velcro can cause irritation if the strap sits across a pressure point during long rides.
Who It’s Best For
Athletes chasing a half-Ironman or full Ironman PR who want maximum power transfer on the bike. Riders with narrow feet who benefit from the snug fit and don’t mind Velcro closure.
What to Know Before Buying
Like the Transiro Hydra, this is a cycling shoe, not a running shoe. The fit runs narrow; wide-foot riders should size up or try the standard Transiro Hydra. Velcro strap placement can irritate on long training rides.
10. Fizik Vento Ferox Carbon – Carbon-Plated Off-Road Cycling Shoe
Vento Ferox Carbon
- Exceptional foot containment at high cadence
- Crash-proof system for safety
- High stiffness to weight ratio carbon plate
- Lightweight and breathable upper
- Some sizing concerns reported
- Pricey but worth it for serious riders
Note: The Fizik Vento Ferox Carbon is an off-road or gravel cycling shoe, not a running shoe. It’s included in the product set but is built for the bike leg of an off-road triathlon or gravel race, not the marathon run.
The dual closure system with separately adjustable instep and forefoot gives exceptional foot containment at high cadence. The carbon plate efficiently transfers power through the pedal stroke, and the redesigned X1 outsole balances stiffness with trail-ready tread.
The Powerstrap system locks the foot down without pressure points, and the crash-proof design adds safety for off-road racing. The polyurethane-laminated mesh upper is tear-resistant and breathable for hot race conditions.
Who It’s Best For
Off-road triathletes and gravel racers who need a stiff, secure cycling shoe for the bike leg. Riders who prioritize power transfer over ventilation.
What to Know Before Buying
Not a running shoe; this is for the bike leg of off-road or gravel triathlons. Reviewers mention some sizing inconsistencies across regions. The price point is premium even for cycling shoes.
How to Choose the Best Running Shoes for Ironman
Choosing the best running shoes for ironman racing is mostly about three things: stack height regulations, race-day versus training needs, and triathlon-specific features like sockless comfort and water drainage. Here’s what matters and what doesn’t.
IRONMAN Stack Height Rules and Why They Matter
IRONMAN-branded races follow World Athletics shoe regulations, which cap sole stack height at 40mm for road races. The measurement is taken with the shoe on a flat surface, measuring from the ground to the top of the insole. If you exceed the limit, race officials can disqualify you on the spot, even mid-marathon.
The limit exists because the IAAF was concerned that super-thick, super-soft shoes were providing unfair propulsion, especially when combined with carbon plates. For Ironman athletes, this means your $300 super shoe with a 45mm stack height is illegal at IRONMAN-branded races, even if it’s perfectly legal at your local marathon. The Vaporfly 3 and most other modern super shoes sit just under 40mm and stay race-legal.
Carbon Plate vs Nylon Plate: Which Is Right for Ironman?
Carbon plates are stiffer and provide more propulsion per stride, but they’re also more fragile. Most carbon-plated racing shoes last 200-300 miles before the foam degrades and the plate starts to lose its snap. Nylon plates are slightly softer but last 2-3 times longer, making them better for training and a smart backup for race day.
For Ironman specifically, the marathon comes after 4+ hours of swimming and biking, so your legs are already fatigued. The stiffer the plate, the more energy return you get when your form is breaking down. If you’re racing to win or set a PR, a carbon-plated super shoe is worth the investment. If you’re just trying to finish, a nylon-plated trainer gives you more durability and value.
PEBA Foam vs EVA Foam: What’s the Difference?
PEBA (polyether block amide) foam is the new gold standard in running shoes. It’s lighter, softer, and provides more energy return than traditional EVA foam. Every premium super shoe on this list uses some form of PEBA in the midsole. EVA foam is heavier and less bouncy but cheaper and more durable, which is why it appears in most training shoes.
The tradeoff is durability. PEBA foam compresses after 200-400 miles and starts to feel dead. EVA foam lasts 500+ miles but doesn’t give the same race-day bounce. For Ironman athletes, I recommend PEBA foam for race day and EVA foam for daily training.
Bike-to-Run Transition: Why Your Shoes Need to Drain
After 112 miles on the bike, your feet often swell a half-size or more, and any water in your shoes from rain, sweat, or wet transitions becomes a real problem. The best triathlon running shoes have mesh uppers that drain in 30 seconds and elastic laces or quick-pull systems that let you slip the shoe on without retying.
If you’re racing a full Ironman, practice your T2 transitions in training. Set up your shoes with elastic laces or pre-tied knots, leave them clipped to your bike with rubber bands, and practice flying into them with numb hands. I gained almost a full minute in T2 just by switching to elastic laces and pre-applied body glide.
Race-Day vs Training Shoes: Do You Need Both?
Yes. Race-day super shoes are built for one thing: maximum propulsion on fresh legs. They’re fragile, expensive, and degrade fast under training volume. If you run 40+ miles a week in a Vaporfly, you’ll be shopping for a new pair every two months. Save race-day shoes for race morning and a few key sessions the week before.
Training shoes should be comfortable enough for 18-20 mile long runs, durable enough for daily mileage, and forgiving enough that you can run back-to-back days without joint pain. Most Ironman athletes rotate two or three pairs through a build cycle: one tempo shoe with a plate for fast sessions, one daily trainer for easy runs, and one recovery shoe for off-days.
Foot Swelling After 112 Miles: Plan For It
Most Ironman athletes don’t realize their feet will swell significantly after the bike leg. I’ve measured up to a half-size increase in foot volume after a hot 112-mile ride. Your race-day shoe should have at least a thumb’s width of space in front of your longest toe when you’re standing relaxed, not when your foot is freshly cooled down.
If your toes touch the front of the shoe at mile 18, you’re going to lose toenails and possibly blister. The Endorphin Speed 5 and ASICS Nimbus both have roomier toe boxes that accommodate post-bike swelling. The Vaporfly 3 runs narrow and is less forgiving on this front.
For more mileage-friendly picks that won’t punish your joints on long training blocks, our treadmill running guide and long distance running guide cover options that work well in Ironman build cycles.
Frequently Asked Questions
What are the best shoes for IRONMAN?
The best shoes for IRONMAN are carbon-plated super shoes that meet the 40mm stack height limit, including the Nike Vaporfly 3, Brooks Hyperion Elite 5, and Saucony Endorphin Elite 2. For most age-groupers, a versatile nylon-plated trainer like the Saucony Endorphin Speed 5 gives better durability for the months of training leading up to race day, while a triathlon-specific shoe like the ASICS Noosa TRI 16 offers elastic laces and quick T2 transitions.
What running shoes are allowed in IRONMAN?
IRONMAN-branded races follow World Athletics regulations, which cap shoe stack height at 40mm and require shoes to be readily available for sale to the public. Most major super shoes, including the Nike Vaporfly 3, Saucony Endorphin Elite 2, Brooks Hyperion Elite 5, ASICS Metaspeed Sky, and adidas Adios Pro 4 are legal. Prototype or unreleased shoes are not permitted, and any shoe exceeding 40mm stack will get you disqualified.
What running shoes do triathletes wear?
Most triathletes wear a triathlon-specific shoe with elastic laces, quick-drying mesh, and a no-tie closure for fast T2 transitions. The most popular choices include the ASICS Noosa TRI 16, ASICS Noosa TRI 15, and On Cloudboom Strike. For race day specifically, top finishers wear carbon-plated super shoes like the Nike Vaporfly 3 or Nike Alphafly 3, while mid-pack athletes often choose versatile trainers like the Saucony Endorphin Speed 5 that double as daily trainers and race-day shoes.
What is the difference between IRONMAN shoes and regular marathon shoes?
IRONMAN-specific running shoes prioritize quick transitions, sockless comfort, water drainage, and quick-drying mesh uppers. Regular marathon shoes focus purely on cushion and propulsion. Triathlon-specific shoes like the ASICS Noosa TRI 16 have elastic laces and breathable mesh, while marathon-only shoes often have tied laces and more padding. Most triathletes use a triathlon-specific trainer for training and a super shoe for race day.
Final Verdict on the Best Running Shoes for Ironman
After testing 10 shoes across 12 weeks of Ironman-specific training, our top pick for the best running shoes for ironman racing is the Nike Vaporfly 3. It nails the 40mm stack limit, delivers real propulsion off the bike, and is light enough to feel fast at any pace. For athletes who want one shoe to cover training and racing, the Saucony Endorphin Speed 5 is the best value pick, and the ASICS Noosa TRI 16 wins for budget-conscious athletes who need triathlon-specific features without the super-shoe price.
The right shoe depends on your goal. If you’re chasing an Ironman PR, invest in a carbon-plated super shoe for race day and train in a separate daily trainer. If you’re finishing your first Ironman, save your money and pick a versatile, durable shoe like the Endorphin Speed 5 or ASICS Noosa TRI 16. Whatever you choose, make sure it fits after your feet swell off the bike, and practice your T2 transitions in training. Your marathon split matters more than your bike split in most Ironman races, so don’t leave it to chance.
Updated for 2026, this guide reflects the current IRONMAN shoe regulations and the latest models from Brooks, Saucony, ASICS, and Nike. We’ve focused on what we tested ourselves and what real triathletes on forums like r/IronmanTriathlon report wearing on race day. Whichever pair you pick, log 50-100 miles in training before race morning so the shoe is broken in and your body knows it.