Under Armour Kids - Grade School Surge 4 (Big Kid). Color Mod Gray/Castlerock/Phoenix Fire. On sale for $45.63. MSRP $55.00.. 4.9 out of 5 stars+4Brand NameUnder Armour KidsProduct NameGrade School Surge 4 (Big Kid)ColorMod Gray/Castlerock/Phoenix FirePrice$45.63MSRP: $55.00Rating5Rated 5 stars out of 5(14)