The main problem with this mask is, as sold, there really is no way of seeing out of it...
I solved this by cutting away the black bits in the mouth, and around the teeth to leave a wider space, but this is definitely a job for a grown-up and leaves rather spiky edges, and still gives you little or no periphiral vision, just enough to cope with walking.
Other than that, it's pretty durable for thin plastic. I was carting mine around in a bag for almost a fortnight and it didn't deform and the colouring stayed intact.