Vivobarefoot Primus 3.5 FG Running Shoe – Men's size-10 Mesh ventilation zones improve airflow

Mesh ventilation zones improve airflow and help regulate temperature during extended runs or back-to-back training days

while a wider base keeps your transitions smooth and stable

6 oz (size US 9) — one of the lightest options we carry for competitive XC racing

8 oz (236 mL) capacity — right-sized for snacks

Vivobarefoot Primus 3.5 FG Running Shoe – Men's size-10 Mesh ventilation zones improve airflowBuilt for runners who want real ground feel on technical terrain, the Primus Trail 3. 5 FG is our pick for athletes transitioning to or training in barefoot footwear. A firm ground outsole with aggressive lugs delivers traction on dirt, roots, and rock, while the wide toe box lets your foot splay and work naturally. Zero drop, minimal stack height puts you in direct contact with the trail for honest proprioceptive feedback Firm ground (FG) outsole