Reduces leg and fin buoyancy and minimizes back stress for a safer, more comfortable dive. Easy draining Delrin buckles securely fasten weights and can be easily released with one hand. Form-fitting design and rugged construction. The weights should fit snugly (not tightly) around the leg (Ankle measurements taken over the suit) Fits ankle sizes 11" to 13", about 3.3 lbs.(1.5kg) per pair.