Manufactured from a new material developed by Rooster in conjunction with a leading technical fabric manufacturer. This top has a Polyurethane coating on the outside for water resistance, durability and flexibility combined with a fleece inner layer to keep you snug and warm - a combination that works well when wet or dry. It can either be worn under your hikers as a base layer, mid layer or as a top layer over them. This really has got to be one of the most exciting products that we have ever developed!