The PANIA full-zip sweater is made from POLARTEC® knit fabric, which offers warmth without weight. While being highly breathable, its fleece back allows the fabric to dry quickly. This sweater is also made of premium quality polyester yarn with 77% REPREVE® recycled polyester fibers from post-consumer plastic bottles. For more details about this fiber from REPREVE® : https://canada.indygena.com/sustainability-developpementdurable