This is the Highland Crotch Strap Features: Used for Fastening Harness and Back-Plate Securely to Diver&';s Body Strap Threads onto Back-Plate & Loop on Harness Waist Belt Webbing Keeps Harness-in-Place During Water-Entry Prevent Gear Slipping-Upwards on Body in Water Reducing Likelihood of Tank Touching Back of Head Preferred by Technical Divers Replacement or Add-On to Harness Assemblies Replacement for XS Scuba Tec/Rec Harness Add-On (Optional) for XS Scuba Dog-Bone Harness Length: 54" (137cm) of Heavy-Duty 2" (5.1 cm) Commercial-Grade Webbing 4-Rivet Construction for Maximum Durability XS Scuba Crotch strap has a looped rivet end and a free end for attachment to harness system of choice. "