From the site: "Features enhanced load-bearing stability, improved anatomical fit and even greater tread durability. Choose the full-grain leather version in Black or the Desert variant that matches split suede leather with breathable Cordura®. Lightweight and athletically inspired, it offers the comfort of prime urethane shock absorption and the climate control of a moisture wicking liner. The vulcanized rubber sole includes directional lug geometry and provides wet/dry traction on both smooth and rough terrain." go to: usstandardissue.com for more tactical gear