Men's Ellipse Long Sleeve Half Zip Hood L - Black. Technically advanced, environmentally conscious and incredibly comfortable, the Ellipse Long Sleeve Half Zip Hood is a hybrid-construction mid-layer that uses strategically-zoned insulation for warmth and protection where you need it most. In the hood and chest panels, we used our MerinoLOFT⢠insulation, which provides a warm, breathable and natural alternative to synthetic insulations, with a 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.