Under Armour Kids - Under Armour Girls Fly By Athletic Shorts (Big Kids). Color Castlerock/Castlerock/Reflective. On sale for $19.95. MSRP $25.00.. 5.0 out of 5 starsBrand NameUnder Armour KidsProduct NameUnder Armour Girls Fly By Athletic Shorts (Big Kids)ColorCastlerock/Castlerock/ReflectivePrice$19.95MSRP: $25.00