Previously known as the Ultra Light, Le Bent's Targeted Cushion is premium blend of bamboo, nylon and merino provides a super soft, dry, warm and non-stink sock. The Le Bent Targeted Cushion Sock is an ultra-lightweight fabric with an X elasticated band system that hugs your foot and stretches up to the leg that provides in-boot comfort for your shin and calf. Mesh ventilation across the foot breathes, regulates temperature and moisture. The fit system supports your foot in each key area: Achilles; instep (upper and lower); and ankle. They really are the ultimate comfort socks for skiing- stretchy, warmth and breathable. Materials 31% Rayon from Bamboo, 21% Merino Wool, 46% Nylon, 2% Elastane Care Instructions These socks can handle whatever you throw at them, but for optimum long term comfort and performance treat your socks to the following: Warm Machine Wash Gentle Cycle - Turn Inside out before washing. Do Not Bleach - You will remove the natural goodness. Do Not Tumble Dry - Best let nature take care of it, they dry fast! Do Not Iron - Would you really want to anyway? Do Not Dry Clean - Best to care for these garments yourself. Le Bent Targeted Cushion Ski Socks