If you would like me to model any props, please tell me in the comments. This is the rebreather that batman uses to save Harley quinn in the Movie suicide Squad. this is scaled to fit uncle jessy (@unclejessy4real)`s 107% sizing of the batman cowl created by Carmelo Nazario(@thecreatorx3d). you might want to use a heat gun on the sides to shape it to Your batman cowl.
use a heat gun to heat the plastic on the sides of the prop, to make it fit your batman cowl.