Mountain Hardwear Ascent Stretch Air Perm Gaiter Nylon The Air Perm Gaiter has a close fit that prevents you from catching on to the rocks and shrubs on the side of the trail. The gaiter's polyurethane coating keeps precipitation out so that your legs and feet stay nice and dry. The gaiters are made from nylon, polyurethane and other materials that prevent skin abrasion. Attach the gaiters to your boots with pinless straps that won't break while you're out backpacking. The multi-use gaiters can be used for a variety of activities, including mountaineering and backpacking.