Icebreaker Size Chart Designed as an active midlayer for cold, high-output days hunting or fishing, the Men's Helix Long Sleeve Zip in Real Tree camoflauge print combines sustainable materials with a technical design. The body uses MerinoLOFT(TM) insulation, which provides a warm, breathable and natural alternative to synthetic insulations. The 100% recycled polyester face fabric features a DWR that sheds light precipitation. Merino jersey stretch side panels help regulate body temperature on active days, and the 100% woven merino lining ensures a cozy feel inside. Zippered hand and chest pockets keeps small essentials like lip balm, snacks and your phone close at hand. Features: - Icebreaker 70gm MerinoLOFT(TM) insulation. - Water resistant face fabric - Internal storm flap - Zippered chest pocket - Zippered front hand pockets - Thumbloops - Main fabric face: 100% Recycled polyester. Side panels: 46% cat-ionic polyester, 38% Merino, 16% LYCRA(R). Lining: 100% Merino