Icebreaker Size Chart Technically advanced, environmentally conscious and incredibly comfortable, the Men's Ellipse Long Sleeve Zip is a hybrid-construction midlayer that uses strategically-zoned insulation for warmth and protection where you need it most. In the chest panels, MerinoLOFT(TM) insulation provides a warm, breathable and natural alternative to synthetic insulation, with a 100% recycled polyester face fabric. In the body and arms the Ellipse Long Sleeve Zip 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) insulation - Hybrid construction with zoned MerinoLOFT(TM) panel - Zippered internal stash pocket - Zippered front hand pockets - Thumb loops - Weight (Size Medium): 490 g / 17.28 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