Icebreaker Size Chart A technical midlayer designed to insulate and breathe during cold, high-output days up in the mountains, out on the slopes or on the trails, the Men's Descender Long Sleeve Half Zip is designed for those on the move. Made with 240gm textured terry corespun fabric, which uses nylon fibers wrapped in merino wool for added durability and quicker drying, the Descender features a high-loft brushed back with heat-trapping channels to help regulate your temperature during technical high-exertion pursuits like skiing, climbing or running in cold conditions. Lighter-weight side panels help manage moisture and dump excess heat when you're moving fast, while the zippered chest pocket with media cord port keeps your music flowing or stashes small essentials. Features: - Striped fleece fabric with channels to trap air for lightweight warmth - Deep venting front zip - Zippered chest pocket with media cord port - Low profile thumbloops - Corespun fabric for added durability - Weight (Size Medium): 321 g / 11.32 oz - Body: 84% Merino Wool, 9% Nylon, 7% LYCRA(R) - Panels: 88% Merino Wool, 9% Nylon, 3% LYCRA(R)