evo.com | Outdoor Research Midlayer Vests > A blend of recycled polyester and merino wool gives the Outdoor Research Crescent Fleece Vest breathable warmth and natural odor resistance without the bulk of sleeves. It's the layer you grab for high-output hikes or a chilly belay ledge when your arms need to stay free. Regular Fit 70% Recycled Polyester / 29% Merino Wool / 1% Spandex Non-Mulesed Wool Binding Elastic Arm Openings Naturally Anti-Odor | Outdoor Research Crescent Fleece Vest Men's 2027 - X-Large Blue | Spandex/Wool/Polyester