The Original Performance Underwear that made everything else obsolete; the Boys's 0 Series Printed Boxer Jock 4 in have you covered for daily activities, hiking, working out, and competing. nice with jeans, shorts, or sweats, and the O Series keeps you cool on the hot days and warm on the cold days. Flexible underwear that moves with you without riding or bunching; the Under Armour Boys's 0 Series Printed Boxer Jock 4 in will be the only pair you'll want to own.