Delighted with the quality and hassle-free delivery of this costume and mask. We ordered an adults S for my tall 12 year old son. It fits perfectly with the legs rolled up, although at the rate he's growing he may not get long out of it. Because of the way the costume is made it's worth making sure the length from shoulder to crotch is long enough. It's just about long enough for us at the moment. The costume is so well made. Very impressive indeed. I would recommend airing out the costume, and in particular the mask, before wearing as there quite a strong smell of new plastic from it.