the 21/22 fw source power air ss hoodie is a sports-centric hoodie, built for intense, high-energy sessions. it's the perfect piece to layer on top of technical base wear for outdoor training in cold weather. polartec® power airâ„¢ fabric captures air to provide warmth, while also providing dynamic stretch. this new fabric is made from 50 % post-consumer waste and also sheds 80 % less microfibres than synthetic counterparts, which means less pollution in our waterways.