Norrona Trollveggen Thermal Pro flexible fleece jacket is developed for mountaineering activities and is a great choice for general outdoor endeavors when the temperature lowers. Norrona Trollveggen Thermal Pro flexible fleece jacket is developed for mountaineering activities and is a great choice for general outdoor endeavors when the temperature lowers. It's made in premium Polartec Thermal Pro because of its superb warmth-to-weight ratio. The Polartec Thermal Pro consists of 100% recycled polyester and has a weight of 295 g/m2. It offers unique knit techniques to create air pockets that trap air and retain body heat, providing outstanding warmth without weight. Not only are they very comfortable, but these fabrics offer excellent breathability, dry quickly, and are very durable and pill-resistant. Key features include a zippered chest pocket, two hand warming pockets, elastic cuffs with thumb holes and a warm and weather protective collar. The jacket has a regular fit with a Y-cut and articulated arms for good movement while climbing. A longer cut in the back ensures extra protection.