Ausangate Alpacor Heavyweight Ribbed Hiking Socks For Men 85% Alpacor/ 15% Nylon Imported Soft welted cuff and instep compression band helps keep sock in place Four-ply double looped inner construction for comfort. Instep and ankle compression bands prevent socks from bunching up inside boots. Soft rib knit and welt cuff keeps socks in place. Flat toe seam. Machine wash and dry alpaca fiber socks.