Icebreaker Size Chart Technically advanced, environmentally conscious and incredibly comfortable, the Ellipse Long Sleeve Half Zip Hood is a hybrid-construction midlayer that uses strategically-zoned insulation for warmth and protection where you need it most. In the hood and chest panels, MerinoLOFT(TM) insulation provides a warm, breathable and natural alternative to synthetic insulations, with a 100% recycled polyester face fabric. In the body and arms the Ellipse Long Sleeve Half Zip Hood features a super-soft and quick-drying blend of merino wool and recycled polyester with side stretch panels that actively manage moisture during cold, high-output days in the mountains or out on the trails. Zippered hand pockets and an internal stash pocket secure all your small daily essentials. Features: - Slim fit - Icebreaker MerinoLOFT(TM) technology - Hybrid construction with zoned MerinoLOFT(TM) panel and hood for warmth and protection - Zippered front hand pockets - Shaped hood for warmth and protection - Secure zippered internal stash pocket - Stretch side panels - Weight (Size Medium): 450 g / 15.87 oz - Body: 75% Merino Wool, 25% Polyester - Panels: 100% Polyester - Fill: 70gm MerinoLOFT(TM) 88% Merino Wool, 12% Polylactide - Alternate images do not reflect actual color