This costume has a fabric that is pretty lightweight, but so far (after two months) it has held up remarkably well. That it is lightweight means my son can wear the cape and run around the house and yard even when it is sunny and warm. The mask is heavier rubber-type material like the belt. I recommend buying a little larger than you think you need.  All costumes run small and no harm is done if it is a little too big. For Trick-or-Treating we'll be able to layer a big sweatshirt under the costume.
I may buy more super hero dress-ups/costumes and have a theme party. Girls get to do the fun princess stuff, tea parties,and such that this is a great way to have a 'boy' dress-up party.