Biothermal is the ultimate, technical performance fabric. Featuring 49% MTF polyester and 51% Bio-silver nylon (silver embedded nylon) . It has the Acclimate moisture management system and inherent anti-microbial properties. Protection lasts the life of the garment. The pant has a performance fit and gives you added warmth without bulk. Textured finish for a distintive look and feel. Flatlock stitching ensures comfortable fit. Reusable packaging. Made in Canada.