LIMITED EDITION FIN SOCKSLimited Edition fin socks will ensure those nasty blisters and sea ulcers remain to a minimum, the socks also make for a good filler if your foot is in between fin size's. Features: Revolutionary fin socks that not only feature superior comfort and durability, but also include a special velcro device to fasten them to the heel of your fin, ensuring they don't slide up or down and stay in the perfect position for maximum comfort.