VivobarefootMen's Obsidian Primus Trail 3.5 Firm Ground Shoes

About

Welcome back the wild.

Human beings aren’t separate to nature, we are nature. When we listen to it's rhythm and connect to its intelligence, we thrive. It's time to get outside and rewild.

Lightweight trail runner and hiking shoe engineered for off-road performance and sustainability. The Primus Trail 3.5 FG features a firm ground outsole for secure footing across varied terrain, breathable mesh construction, and an Active Ortholite insole made from 98% recycled PU foam. At just 281g per shoe, it delivers the minimal, connected feel Vivobarefoot is known for while reducing environmental impact. Rewild your run.

Product Features

• Trail runner or offroad hiker, built for exploration with minimal environmental impact.
• The Primus Trail 3.5 FG combines lightweight flexibility with rugged durability across rocky terrain.
• Constructed from recycled, vegan materials—76% recycled polyester in the upper, it delivers a natural fit and responsive ground feel.
• Expert choice for runners committed to both performance and sustainability.
• Firm ground outsole with sticky rubber compound and 3mm base ensures reliable grip across wet, dry, rocky, and concrete surfaces.
• Engineered for technical trail performance
• Textured arch zoning provides enhanced stability during demanding footwork.
• Built for durability and multi-terrain confidence.

Product Specifications

• Firm Ground Outsole: Stand firm on multiple terrains.
• Ortholite Insole: The Active Ortholite Performance Insole is made of 98% recycled PU foam, which helps reduce waste and the use of virgin plastics.
• Tough rubber compound: Strong, non-marking rubber compound for sticky grip and high-abrasion when you need it most.
• Vegan: *The main materials in all our Vegan* products are synthetic and aren’t derived from animals. We don’t (yet) have the transparency we need over the production of all the small components (such as adhesives and dyes) used in these products to ensure they meet vegan best practices. So, whilst we believe the shoes are vegan, we’re not yet able to guarantee it and want to be fully transparent.
• Weight: 281g
• Sole base: 3mm
• Tread Depth: 2.5mm