The Under Armour Tech 9 Inch Fitted Boxer Briefs - 2 Pack 1363622 offers all the best of UA with the ability to wick sweat, 360 degree stretch, anti-odor control fabric and longer legs, with two boxer briefs in a multipack. Under Armour's Tech 9 Inch Fitted Boxer Briefs - 2 Pack is made of polyester/elastane.