T1
Trail Running, Hiking, Race
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APMA Seal of Acceptance
This product received the American Podiatric Medical Association (APMA) Seal of Acceptance, awarded to products found by the Association to promote good foot health.
Weight
Drop (Stack Height)
Cushion
Stability
- Upgraded TUNEDFIT Dual Lacing System for separate lace adjustment
- LightCELL midsole base featuring excellent lightness and bounce
- Vibram Megagrip, Litebase, and Traction Lug technology
- High-performance woven fabric upper reinforced with aramid fibers
Men's
| USA | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 | 45 | 46 | 47 | 47.5 | 48 | 49 |
| UK | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 13 |
| CM SIZE | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | 30 | 30.5 | 31 | 32 |
Women's
| USA | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 35.5 | 36 | 36.5 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 |
| UK | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 |
| CM SIZE | 22 | 22.5 | 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 |
Drag horizontally to see more
Size Measuring Guide
A perfect fit for your ultra-marathon running shoes is important for comfort and performance. Follow these tips to measure your foot size at home:
General Tips:
- Measure your feet at the end of the day as they're at their largest due to swelling.
- In between sizes? One foot is bigger than the other? Take the larger size.
- It's best to measure every year. Your size could change over time.
What You'll Need:
- A piece of paper larger than your foot,
- A pen or pencil,
- A ruler or measuring tape,
- Socks of the thickness you'll wear with the shoes.
Steps:
- Stand on the paper in the socks you'll wear with the shoes.
- Use the pen or pencil to mark the end of your longest toe and the back of your heel. It's important to measure both feet as their size can vary.
- Match your measurements to our size chart to find the best fit. If you're between sizes, we suggest choosing the larger size for better comfort.
Men's
| USA | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 | 45 | 46 | 47 | 47.5 | 48 | 49 |
| UK | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 13 |
| CM SIZE | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | 30 | 30.5 | 31 | 32 |
Women's
| USA | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 35.5 | 36 | 36.5 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 |
| UK | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 |
| CM SIZE | 22 | 22.5 | 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 |
Drag horizontally to see more
Size Measuring Guide
A perfect fit for your ultra-marathon running shoes is important for comfort and performance. Follow these tips to measure your foot size at home:
General Tips:
- Measure your feet at the end of the day as they're at their largest due to swelling.
- In between sizes? One foot is bigger than the other? Take the larger size.
- It's best to measure every year. Your size could change over time.
What You'll Need:
- A piece of paper larger than your foot,
- A pen or pencil,
- A ruler or measuring tape,
- Socks of the thickness you'll wear with the shoes.
Steps:
- Stand on the paper in the socks you'll wear with the shoes.
- Use the pen or pencil to mark the end of your longest toe and the back of your heel. It's important to measure both feet as their size can vary.
- Match your measurements to our size chart to find the best fit. If you're between sizes, we suggest choosing the larger size for better comfort.
Dual Lacing, Refined
Experience enhanced comfort and control with our signature TUNEDFIT™ Dual Lacing System. Now with two cinch cords per shoe, you can adjust the fit around the forefoot and midfoot independently in seconds. With the adjustable fit, it lets your toes splay, flex, and power through the longest runs in the toughest terrain.
Dries Fast, Built to Last
Crafted from a high-performance woven fabric and reinforced with aramid fibers that are five times stronger than steel, the T1’s upper is relentlessly durable. Its anti-siphon knit tongue repels water, ensuring a breathable, fast-drying design that thrives in the harshest conditions.
Midsole Mastery
LightCELL™, our proprietary midsole, is turbocharged through supercritical foaming. LightCELL™ weighs just 50 percent of EVA while offering 45 percent greater energy return – it’s battle-tested by hundreds of ultrarunners for consistent responsiveness, mile after mile.
Vibram®’s Finest
The T1’s outsole features a trio of Vibram® innovations: Megagrip rubber for tenacious traction in any condition, Litebase for 30 percent less weight without compromising performance, and Traction Lug micro-features for up to 25 percent more grip.
Gallery

Compare our models
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4 mm
(Heel 36 mm, Forefoot 32 mm)
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High-performance woven fabric reinforced with aramid fibers
Our road-to-trail running shoe featuring a sustainable yet high-performance midsole.
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Our road-to-trail running shoe featuring a sustainable yet high-performance midsole.
Mixed terrain, gravel, light trails
8.5 oz / 242 g
6 mm
(Heel 35 mm, Forefoot 29 mm)
CircleCELL™
VersaGrip™
TUNEDFIT™ Dual Lacing System
Jacquard and high-performance woven fabric reinforced with aramid fibers
Have run in these for nearly 100 miles and can't say I'm surprised by the quality. Have a pair of H1s (favorite shoe ever) and wanting something more fit for technical trails. These are (nearly) the shoes! Love the grip, the toe box, and the quality these shoes present. Have 2 recs for this shoe. Use a similar lacing system as the H1s with the cord lower and lace upper. Would like the ability to heel lock lace above. And utilize the circle cell tech in a trail shoe. Circle cell + Vibram lugs would be a game changer!
Super light weight. Would love more colors.
I love this shoe but I’m always a size 11 and the T1 is to big and fits like a 11.5
Very comfortable light weight
Lightweight yet sturdy and built for high mileage.