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The Primus Trail 3.5 FG is for runners who live for the end of the road. These all-terrain trainers are light and flexible enough to move freely, and tough enough to run wild on rough, rocky ground. Made with recycled, vegan*, high-performance materials. We're on a mission to create a fully circular shoe – a new Vivo made from an old one, which can in turn be made into another. The Primus 3.5 is a big step forward on this journey. With an already mechanically recyclable outsole, the challenge is making an upper from 100% polyester, which can be recycled. The new Primus Trail 3.5 upper takes us from 34% to 76% polyester, of which 93% is recycled. Why not 100%? Because some parts of the upper still need extra durability that polyester can't yet provide. We’re working with our partners to figure out this final piece of the puzzle.
30 Days
Return within 30 days in the original packaging for a full refund. Keep items clean and unworn. Worn, dirty, or missing packaging cannot be accepted.
Your feet were made to spread and grip. A foot-shaped toe box lets every step feel open, steady, and natural.
When heel and forefoot sit level, the whole body stacks better. You stand taller, move smoother, and feel more balanced.
A thin, flexible sole brings back ground feel. That feedback builds confidence, stability, and control.
Your complete barefoot journey starts here. Get our new Cruiser shoes plus essential foot health tools: toe spreaders for natural alignment, a massage ball for recovery, comfortable socks, and no-tie laces. Everything you need to move naturally and restore your feet's strength from the ground up.
10% off all accessories when purchased with any pair of shoes
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