Ulvang Ultra is a thin yet warm wool sock for everyday and sports wear. Utlra is soft and comfy, with a reinforced toe and heel for long wear. This sock offers good remperature regulation and wicks away moisture. This makes it the right sock for any activity, winter or summer. Calf height. This yet warm merino wool sock Long-wearing sock for work, sports and outdoors The whole family's favorite. Also available in kids' sizes Oeko-Tex and Woolmark Blend certified Materials60% Merino Wool, 36% nylon, 4% Lycra Wash InstructionsMachine wash 40°C, using wool cycle. Use wool detergent.