Our 5 year old was obsessed with being Bowser last Halloween. We found 2 child size options and chose this one as the other was a body suit and we thought it would be difficult for him to put on and take off to go to the bathroom on costume day at school. The shell worked great on this one, but I would say it wouldn't be durable since it's inflatable. It could be adjusted with elastic straps. The headdress was ridiculous. It has great details, it looks like a Bowser, but it's really really heavy. It was snug enough, but when my son put it on, the weight made it lean back. This would result in part of the collar/necklace cutting into his neck, which was very uncomfortable. We tried pinning it to the cap and throwing away the collar, but again it was too heavy and easily fell off our heads without a collar to hold it. He was very excited about this costume but ended up feeling so uncomfortable that he asked us to take it off during a trick or treat. He suffered for him, but he wasted money on it for me. I do not recommend.