The Under Armour Ua Performance Tech boxer briefs are made of extremely lightweight, soft and durable fabric with breathable mesh zones that provide ventilation where it is needed most. 4-Way Stretch technology allows for better movement in every direction. The material wicks sweat and dries quickly. The elastic waistband and the absence of side and back seams provide maximum comfort. Odor control technology reduces unpleasant odors. The main fabric contains at least 90% recycled polyester.