A four-way stretch top as equally fit for training days as it is race time. One external chest pocket and two internal skin pockets to keep your skins warm and sticky for the next climb. The tight fitting hood keeps your head warm while fitting under a helmet. The Nilit Innergy fabric transforms body heat into infrared rays as engineered by the mad scientists over in Austria. We don't have any physics PhD's to explain any further but we're sure this is the right piece for all of your training and competition days.