The Tusa TA-81 Stainless Steel Spring Straps (sold as a pair) are a great addition for most open-heel scuba fins. A definite upgrade to standard straps, spring straps do not need to be adjusted for size and easily slip over the heel securely when donning/doffing. The TA-81 features a rubber heel grip with large finger loop and TUSA patented buckle system for easy attachment.