The REI Evolution harness is made with high quality 1/4" foam laminated to a durable 500-denier Cordura(R) nylon exterior and lined with soft nylon tricot for comfort. It is formed to be wider in the back of the legs and waist to give support and it is tapered in front for mobility. The leg loops are auto-adjusting and feature a 3" elastic band for a comfortable and customized fit. There are two rear keeper straps featuring quick-release buckles that can be easily unbuckled for adjustment or to answer the call of nature. The REI Evolution harness also includes four rigid gear loops for on-harness racking plus a dedicated belay loop and rear haul loop.