Leather upper Ortholite insole Tough rubber compound Firm ground outsole Vegan The Primus Trail Iii All Weather Firm Ground Is A Water-Resistant Evolution Of The Primus Trail Fg: The Original, Best-Selling Trail-Running Sneaker. Similarly Light, Durable And Flexible For Varied Hardpack Trail Adventures – Made With Recycled, Vegan*, High-Performance Materials – The Primus Trail Iii Aw Fg Features Water-Resistant Materials For Trail Runs And Hikes In Wetter, Cooler Climes.