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Whether you wear it under your ski shell on teeth-chattering days or over a base layer on cold-weather hikes, the women's Helix long sleeve zip hood provides technical, sustainable warmth when you need it most. This hybrid mid layer features a 100 percent recycled polyester shell as well as stretch side panels to improve mobility and regulate body temperature. INSIDE the Helix, we used our innovative 70gm Merino loft insulation, a sustainable and high-lofting alternative to synthetic fills made from all-natural Merino wool (up to 10 percent of which is recycled). Merino loft retains warmth even when wet and naturally helps regulate body temperature to keep you comfortable. Zippered hand pocket store cold hands and small essentials.