After spending over $150 on fins and supplys, I feel that these fins are not as great as they claim. Walking in shallow water was really hard to to the increased resistance created now by a fin going up to my knee. I am a County Rescue Team diver and Instr for a few Agency's and have tried these in the pool, open water, and on a recovery and I will be sticking to my basic ForceFin. I have let other divers I know try these and even 2 commercial divers and none of them liked them. They wee all glad to get to try my waste of money before they went and did the same.