Primus Trail 3.5 FG. Men's
Rewild your stride with the Vivobarefoot Primus Trail 3.5 FG – a lightweight, tough, and flexible trail-running shoe built for untamed terrain and conscious movement.
Crafted for runners who thrive beyond the pavement, the Primus Trail 3.5 FG is designed to keep you light on your feet while staying tough against rocky, unpredictable landscapes. Made using high-performance, recycled vegan materials — including a 71% recycled polyester upper — this version takes you one step closer to fully circular barefoot footwear.
Engineered with a grippy Firm Ground outsole, ultra-breathable mesh, and a thin, barefoot-friendly design, it's the go-to trainer for wild adventurers and eco-conscious runners alike.
Key Features
- Firm Ground Outsole – Durable, grippy lugged sole designed for rocky, hard-packed, and mixed trails
- 71% Recycled Polyester Upper – Lightweight, breathable mesh made for trail ventilation and sustainability
- Ortholite Insole – Made from 98% recycled PU foam for comfort and reduced waste
- Barefoot Design – Zero-drop sole and wide toe box to support natural movement and foot strength
- Vegan-Friendly – Made from animal-free materials (note: adhesives and dyes not yet certified)
- Flexible Construction – Enhances foot mobility and trail connection
Run wild. Move free. Respect the earth beneath your feet.
Size Chart
Primus Trail 3.5 FG. Men's
Customer Reviews
Im comparing these to the knit lite primus which I love! The sole is fairly thick on these for the trails and my feet aren't the most comfortable. These trail ones are a bit smaller in width than the knits and honestly I wish I passed on these but they're great for winter to get you off the ground and way from the slush. They are significantly better build than the knits as well. Would recommend trying them before buying especially with the price.
Highly versatile, good fit and flexibility. Needs to be wider for the pinky toe, it gets pressed against the side.