Finis Lycra Skin Socks Size Chart
  Small Medium Large
US Men's 2-5.5 6-9.5 10-14
US Women's 3.5-7 7.5-11 11.5-15.5
EUR Men's 33-38 38-43 43-48

These are general guidelines only, sizes are not guaranteed. But no worries, since at LeisurePro we offer our exclusive PFF Guaranty