Under Armour Kids - Boxer Brief Underwear (Big Kid). Color Royal. Low Stock. On sale for $15.60. MSRP $26.00.. 5.0 out of 5 starsAdd to favorites. 0 people have favorited this7 left in stock+6Brand NameUnder Armour KidsProduct NameBoxer Brief Underwear (Big Kid)ColorRoyalPrice$15.60MSRP: $26.00Rating5Rated 5 stars out of 5(5)