Endura Women's Baabaa Merino Winter Sock. These warm winter socks deliver the benefits of merino wool . 38% Merino Wool / 37% Acrylic / 14% Lycra / 11% Nylon Blending Merino Wool with Acrylic, Lycra and Nylon creates a harder-wearing sock, compared with 100% Merino hosiery The Lycra content enhances the sock's stretch and recovery properties. Merino retains its gift for retaining warmth, even when wet. Pique upper for optimal breathability. Terry sole for comfort. Stretch arch support. Easycare machine wash at 40 degrees. Endura Sizing Guide .