Under Armour Kids - Under Armour Kids Performance Tech Solid 3-Pack Boxer Briefs (Big Kids). Color Black. On sale for $21.00. MSRP $28.00.. 4.8 out of 5 stars+3 colors/patternsBrand NameUnder Armour KidsProduct NameUnder Armour Kids Performance Tech Solid 3-Pack Boxer Briefs (Big Kids)ColorBlackPrice$21.00MSRP: $28.00Rating5Rated 5 stars out of 5(4)