Merino Wool is the ultimate fabric in body temperature management Designed to keep you comfortable in warm or cold conditions Designed for function and a performance fit with an improved durability, contoured shape, and a comfort fit Premium superfine 17.5 micron wool fibers deliver a non-itch experience Incredibly soft, smooth and comfortable feeling on your skin. Dual-Blend Wool for superior function and durability Wool is naturally odor resistant and moisture wicking Fabric Contents // 95% Merino, 5% Spandex