When UA introduced the O Series Underwear, all other men's athletic underwear was rendered obsolete. The Men's O Series Boxerjock® 3" boxer briefs are built from our smooth, sleek HeatGear® fabric for the best performance. UA's signature Moisture Transport System to keep you cool, 4-way stretch to keep you moving, and anti-odor technology to keep you fresh. Forget your old boxer briefs that bunch up, wear out, or lose shape. The Men's O Series Boxerjock® 3" underwear stretches, recovers, and fits exactly how you want it to.