The new and improved Primus Trail 3.5 FG is here! Made with recycled, vegan, high-performance materials – including a 71% recycled polyester upper and 98% recycled PU ortholite insole. Bringing Vivobarefoot closer to their goal of creating a recyclable shoe. The Primus lite 3.5 FG is an all-terrain shoe, with lugs to give you extra grip, a little bit of lift from the ground making it the ideal transition shoe for those new to minimalist shoes. This shoe is light at 281g and breathable with the mesh upper and sides. This style will replace the Primus Trail III in a few seasons time.