Crew: Approximately fits men's US shoe size 7-13, fits women's US shoe size 8.5-14.5. Made of 56% cotton, 41% polyester, 3% elastane, exclusive of elastic. 

Knee High: Approximately fits women's US shoe size ~5-14.5, men's US shoe size ~3.5-13. Stretches to fit calves up to 21 wide without distorting designs. Made of 58% cotton, 39% polyester and 3% elastane, exclusive of elastic.