Cotton Machine Wash ONE SIZE FITS MOST - Suit for US Men's Sock size10-13/shoe size 6-12. - Shipped by FBA. Package Includes: 6 Pairs Socks The Heel Tab is a special design in the ANTROP socks. It stand for Flight, Speed and Freedom. Good looking is not the only thing provide, it also help us fall in and uncoils the socks. Material. ANTROP socks made of 88.3% combed cotton,10.7% polyester , 1% spandex. In order to achieve high quality comfortable, ANTROP selected the combed?cotton?yarn to built the frame of Socks. The combed?cotton?yarn?have better performance in Service life,Smooth degree and air permeability. The spandex mostly used in ankle part in the socks , it make socks stretch to fit your foot With spandex. Manufacturing technique. Maintain the high quality is only depend on the material. ANTROP also add the latest Manufacturing technique included stereo Y-heel,comfort toe seam and half cushion. Those method make socks reach balance in soft, and the air-permeability and moisture wicking performance. In short, ANTROP suit different movement and situation.