3M DBI-SALA ExoFit X300 Wind Energy Climbing Harness* In addition to the great features you've come to expect in the ExoFit X300 harnesses, the wind energy harness features aluminum side and chest d rings. * The ExoFit Nex is one of the easiest harnesses to adjust. Revolving Torso Adapters adjust harness fit with ease and speed and lock webbing into place to maintain a comfortable and safe harness fit. * The X300 comfort harness is built with 6,000lb polyester webbing, robust nylon polyester hybrid