Inov-8 Men's Terroc 330 Trail Running Shoe Endurance Rubber Compound - Formulated for an optimal balance on wear and mixed terrain grip. Comfort Last - Generous fitting and offering a more comfortable style. Ideal for training and long distances particularly on trails. Unisex - Built on a last based of an average runner's foot giving a good fit for both male and female Webbing Upper Support - Lacing attached to nylon webbing, cradles and secures the upper behind the metatarsal heads. Terra Shank - A polymer shank positioned behind the metatarsal heads providing underfoot protection. A softer compound is used on performance product while a firmer compound is used on the endurance product.