MATERIAL: 35% MERINO WOOL, 33% POLYESTER, 30% COTTON, 2% ELASTAINE. SIZE: 9-11, 10-13 COLOR: MULTI COLOR . DESIGNED FOR EXTREME TEMPERATURES - These insulated cold socks have been specially designed to keep your feet warm even when the temperature outside is too low. The weatherproof socks men's are ideal if you are working outdoors, go skiing or enjoy hiking and camping in the mountains during the winter. WASHING INSTRUCTIONS - Featuring the finest merino wool, our men's winter socks can be Machine wash warm and tumble dry medium for best results and longest socks life. Use only non-chlorine bleach when needed. Washing Instructions: Machine wash cold and tumble dry low. DO NOT dry clean, iron, or bleach.