work well to make slightly large fins fit right
these work well with fins that are a bit too big to keep them in place
the product stays tight at the ankels and snug around the foot. I am a size 7.5-8 in regular shoes. It works great and hasnt stretched out yet. I WOULD buy this product again.
The problem with these is that both the original shipment and the replacement shipment had manufacturing defects. The hole youput your foot in was too small to even get your foot into! I always seemed to get a right foot that was fine and a left foot that was messed up. I finally just got my money back. Buy a different manufacturer's solution for these!