Under Armour 1/4 quarter zip long sleeve heat gear shirt Boys Youth Medium M

Under Armour Boys quarter zip 1/4 long sleeve heat gear collared polo. Boys Youth Medium M. This shirt is in excellent shape other than the flaw on the back top shown. I am not sure what the spot is, it seems to be some sort of sticker residue and may come off with some goo gone etc. I see no other flaws/stains/signs of wear.