Couver Premium Quantity Cotton Knee High Referee Socks Multi-Assorted Pack Material: 80% Acrylic; 20% Spandex Knee High Sock; Casual, Christmas, Helloween, Fun, Classic Accessory Socks. Size: Medium( 9- 11 fit most adult women) ; Youth Medium( 6 - 8 yeasrs) ; Youth Small( 4 - 6 yeasrs) ; Youth extra Small( 1 - 3 years) Rainbow socks Sizes 1-3 and 4-6 come with non-skid bottom to prevent slipping. 1 units include 6 pairs socks.