Cressi Fins Size Chart
  XS/SM SM/MD MD/LG LG/XL XXL
US Men's Shoe Size 5-7 7-9 8-10 10-13 14
US Women's Shoe Size 6-8 8-10 10-12 12-13 14
Euro Shoe Size 38-40 40-42 41-43 43-46 47

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