The Pe/Wo Hybrid Half Zip T-Shirt is an insulated base layer for everyday use in any season. The shirt features gusseted sleeves. quick-drying and thermal insulating material. a stand collar. and a quarter zip at the front. Using the same structural design as the Spring/Summer Pe Power Dry. the Pe/Wo Hybrid line is made from recycled polyester. graphene. and wool for additional thermal insulation.