Completely free of seams, SmartKnit socks fit like a second skin and are recommended for people with diabetes, arthritis, or any condition where protection from irritation is important Truly seamless—prevents blister-causing pressure points often caused by bulky and uncomfortable sock seams Form-fitting design—fits like a second skin, with no wrinkling or bunching and help in reducing the chances of circulation restriction Non-binding Halo Top™—elastic-free top helps prevent painful leg indentations Moisture-wicking fibers Polyester and Lycra material Machine wash warm. Tumble dry low. No Bleach. 100% USA made Sold as a pair Unisex Size determined by shoe size:Extra-Small - Women's: 4.5-6.5, Men's: 3.5-5.5DS1201-MINI, DS1211-CREW, DS1261-KHSmall - Women's: 7-9, Men's: 6-8DS1202-MINI, DS1221-CREW, DS1271-KHMedium - Women's: 9.5-11, Men's: 8.5-10DS1203-MINI, DS1231-CREW, DS1281-KHLarge - Women's: 11.5-13, Men's: 10.5-12DS1204-MINI, DS1241-CREW, DS1291-KHExtra-large - Men's: 12.5-14DS1205-MINI, DS1251-CREW, DS1301-KH✅ FSA & HSA Eligible