The Under Armour Men's Original Series Boxerjock 9 For The Benefit of Mankind: The World's Most Comfortable Underwear. Original Series The Original Performance Underwear that rendered everything else obsolete. This underwear is built from UA's smooth, sleek HeatGear fabric for the best performance. The signature Moisture Transport System keeps you cool, the 4 way stretch keeps you moving, and the anti odor technology keeps you fresh. Forget your old boxer briefs that bunch up, wear out, or lose shape. The Original Boxerjock 9 underwear stretches, recovers, and fits exactly how you want it to. Constructed of 90% polyester, 10% elastane fabric. Lightweight, 4 way stretch HeatGear fabric delivers exceptional comfort and mobility. Moisture Transport System wicks sweat and dries fast. Tagless interior. Performance waistband. Working fly. Anti Odor Technology prevents the growth of odor causing microbes. Fitted contoured to the body designed to be very close to the body without the constriction of compression. 9 inch inseam. Import.