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O Series -- The Original Performance Underwear that rendered everything else obsolete. These boxer shorts feature Under Armour's signature moisture transport system, loose fit, anti-odor technology, button fly, and elastic waistband. 4" inseam.
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HeatGear: Wear this to feel cool, dry and light. Ideal for days when it's 75 degrees and above, HeatGear delivers a highly breathable construction that wicks sweat to the surface to keep you cooler, drier and lighter than ever.











