Top 100% Merino Wool. Regulates body temperature by controlling the rate of evaporate cooling. Soft next to skin with flat needle stitching for no-rub comfort. Naturally moves moisture away from skin and itch free. Pants 100% Merino Wool. Regulates body temperature by controlling the rate of evaporative cooling. Soft next to skin with flat needle stitching for no-rub comfort. Naturally moves moisture away from skin.