It ’s about $ 57 in dollars. This sock is recommended for indoor use. It is a pile that wraps around your feet. This sock has multiple functions. Keeps you warm; Not get stuffy in socks; Moisturize; Cuts UV rays. A washable silk made of all-purpose fiber that is gentle on the skin. ●material silk70%,Nylon20%,polyester8%,Polyurethane2% ●Laundry　Guide Put it in the net, wash it with a neutral detergent. Hang it in a well-ventilated shade. If pills are formed, remove them with a pill remover so as not to pull them. The thread may get caught. It is recommended to use it in a house where shoes are rarely put on and taken off.