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Road Running, Walking, Supportive
We offer free shipping on all orders and the estimated delivery time is 2-5 working days in the US.
We offer free return or exchange on unworn, unwashed shoes within 30 days.

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.
- 3D Archrail technology as a revolutionary stability enhancing solution
- GOFLOW midsole geometry to guide your stride
- LightCELL midsole base featuring excellent lightness and bounce
- Dual-zone insole provides exceptional arch support and heel stability
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.
























































































































Stability Shoes Reimagined From The Ground Up
Breaking the Mold
Pronation is essential to our normal gait, but for some runners, uncontrolled overpronation may lead to problems. For decades, lab studies have noted a correlation between overpronation – especially excessive foot eversion – and lower limb complaints. Historically this insight led many brands down the route of heavy motion control shoes. These shoes incorporate a rigid support structure within the medial side of the rearfoot and under the arch to control heel eversion and increase rearfoot stability. However, we believe there is something more important that requires our focus.

Research, Rethink, Run
Our biomechanics research revealed that runners who experience discomfort associated with overpronation tend to display excessive forefoot abduction. Normal forefoot function is vital for pain-free running as the forefoot spends more time in contact with the ground, experiences higher peak pressure, and acts as a rocker during propulsion. If we truly wish to manage complaints related to overpronation, we need to look towards the forefoot.
3D Archrail: A Stable Revolution
These findings led us to develop our groundbreaking 3D Archrail technology: a flexible support structure that significantly reduces peak forefoot abduction angles and activates the abductor hallucis muscle in the arch of your foot. The result is a revolution in stability that helps you to achieve better foot balance for irritation-free running.
Feel the Lightweight Cushioning
Our LightCELL™ compound is fueled by the industry-leading nitrogen supercritical foaming process. It is eco-friendly and showcases 50% reduced weight and 45% increased energy return compared to traditional EVA midsoles.


Get in the Zone
Designed to guide you from heel to toe, our GOFLOW midsole geometry steers each of your foot strikes to help you stay in the flow state and enjoy a consistently smooth running experience.


Provides exceptional arch support and heel stability you need on the longest runs.


Offers quick lockdown with increased support on the midfoot.


Creates a plush step-in feel with foot-hugging comfort.
I just received my 1st pair of P1's. First pair of shoes I didn't have to break in. They're so comfortable right out of the box.
They run a bit full, but I can make them work !
This is my first pair and I've not gotten them broken in yet, but my initial opinion is very high. Extremely comfortable right out of the box. Seems to be well made, but time will really tell. Not as wide of shoe box as Altra, however, roomy enough for those who do like a wider box. Overall I think this will be a good shoe for me.
This is my second pair of these shoes. I liked the first ones so much, that I bought a second pair for travel. I especially like that they stabilized the foot more when moving side to side in HIIT classes.
I broke into these shoes on my first run back following a 100-mile race. Right away, I could tell that my feet and legs were happier thanks to the comfort and cushioning. I also appreciated the arch support - as someone who has worn insoles for almost my entire running career, I found that these shoes provided just as much support as my normal added insoles did. These have quickly become my go-to trainers and I'm excited to see how many miles they'll take me!
These are so amazing I love these for daily wear and walking