Loosely shaped to fit closer than other activewear boxer contenders, the Mountain Hardwear eXtend Featherweight Boxer is the undisputed champion of wicking comfort thanks to a polyester microfiber knit material treated with a VisaEndurance finish that facilitates moisture management while minimizing odor. The Mountain Hardwear eXtend Featherweight Boxer is a superb four-season baselayer that fits in perfectly with hiking, biking, camping, climbing, skiing and mountaineering.