Under armour heatgear hero top junior the under armour heatgear hero compression top is built for heroic performance thanks to under armours heatgear fabric with a 4 way stretch construction allowing for greater mobility on every direction kids base layer top compression fit heatgear fabric 4 way stretch fabrication moisture transport system anti odour technology upf 30 protection chaf free flatlock seam construction machine washable captain america 13 xlb