Mares "Volo" Open Heel Fins Size Chart
  SM REG XL
US Men's shoe size 6-9 9-11 11-13
US Women's shoe size 7-10 10-12 12-14
European Men's shoe size 38-43 43-45 45-48
Length (inches) 23.2 24.5 25.3
Width (inches) 7.5 7.75 7.9
Weight (pounds per pair) 2.5 3 3.4

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