Review on Long Floating Fins For Swimming And Snorkeling By FINIS – Use Size Chart For Accurate Sizing by Bobby Washburn

The colors apparently determine the size, and it is not shown what size the fins are unless you scroll through the pictures and see the sizing chart. Turns out the sizing chart was wrong, and the fins I ordered (the largest ones btw) needed to be returned because I couldn't begin to fit my feet inside. I'm incredibly disappointed and I already got my money back. The only reason it gets two stars is because the quality seemed nice.