The Extreme is a base-layer, mid-layer and outer layer combined. For optimum lightweight comfort and performance it should be worn against the skin or over a fast wicking technical layer. This is a clothing system for the really active user who wants to minimise the stop/start routine associated with adjusting a traditional layered clothing system. Through sophisticated venting and construction details, the Extreme smock offers comfortable use across a much wider range of temperatures than competitive products of this type. It is ideally suited to all high activity outdoor sports in extreme weather conditions.