Walking over difficult terrain in both wet and dry environments is made easy with the directional lug geometry and the vulcanized rubber sole featured on the Oakley SI Assault. This sole also grips rough and smooth surfaces while a gusseted tongue keeps debris from entering. The boots are lightweight so they do not tire the wearer over long distances and they provide comfort with urethane shock absorption. They also feature a specialized, climate control liner that comes treated with an anti-microbial agent. The soft temper materials remove the need for a painful break-in period and make them both instantly comfortable and virtually silent to walk in.