This is a custom $30 Ninja Turtle beanie from Etsy seller Miss Pamela. One minute you look kinda like an aviator, then you flip the mask down and BAM -- you're unmagically transformed into everyone's least favorite ninja turtle, Donatello. "...He's actually my favorite." BWAHAHAHAHAHAHAHAHAHA! F***, mine too. :/
Thanks to Mark, who tried ordering a yellow masked 'Botticelli' version but Miss Pamela refused to make a non-canon character.