Under Armour Kids - Boxer Brief Underwear (Big Kid). Color Tech Blue. On sale for $18.75. MSRP $28.00.. 5.0 out of 5 starsAdd to favorites. 0 people have favorited this+5Brand NameUnder Armour KidsProduct NameBoxer Brief Underwear (Big Kid)ColorTech BluePrice$18.75MSRP: $28.00Rating5Rated 5 stars out of 5(5)