Ouch Reversible Eyemask Black. This eyemask is designed with a polyurethane PU leather and a neoprene side, this allows you to choose the material you will feel on your skin by simply turning the mask around. The Neoprene side is colored and the PU leather side is black for a rougher look! It features an elastic strap to ensure it fits almost everyone! Specifications: material side 1 Neoprene. Material side 2 polyurethane PU Leather. One size fits most.