Channeling inspiration from the free and colorful wings of a butterfly, these super-soft Merino wool socks feel most at home in the wild. Designed with premium features to keep your feet comfy, you'll benefit from stuff like ventilation panels and dynamic arch support. Crew height Super-soft Merino wool with natural elasticity for flexibility but no slipping, bunching, or friction Lightweight mesh panels for maximum breathability and ventilation Dynamic arch support with light compression to provide extra comfort and lessen fatigue Cushioned footbed with uber-squishy padding for your heel, arch, and toe Seamless toe which limits irritation or chafing 38% Acrylic, 35% Wool, 26% Nylon, 1% Spandex S/M 9-11 (Women's Shoe Size 6-10.5 and Men's Shoe Size 5-9)