Blending just-right cushion with minimal coverage, these lightweight socks keep a low profile. Light cushioning at the heel and toe, snug arch support, and breathable mesh zones combine for on-the-run comfort. Small (S) = US Women's Shoe size 4-6.5 Medium (M) = US Men's Shoe size 6-8.5 AND US Women's Shoe size 7-9.5 Large (L) = US Men's Shoe size 9-11.5 AND US Women's Shoe size 10-12.5 Extra Large (XL) = US Men's Shoe size 12-14.5 Brooks Ghost Lite No Show Socks 2-Pack