Bought this for my 7-year-old son and he loves it! Calling it a costume hat is doing the product a injustice. It is extremely sturdy and adjustable. It looks and feels just like the Pith helmets I have seen used at stateside digs. The only difference I noticed is the strap on this helmet is for decoration instead of for keeping the helmet on during windy days. My son has a rather large head and so I was not sure how small it would come. I would offer that it should be classified as medium. We actually adjusted it tighter for a snugger fit! Now I know he will be able to use it for a couple of years!