We bought several of these in different animals for my kids to go to school. We chose the adult size because I saw a review somewhere that they run small. We also ordered children's sizes at the zoo and they were too small. The penguins were very big. I put it on and it kept trying to fall off my nose. Then I tried the crocodile and it fit me perfectly and only loosened a bit on my son. I can sew so just got the ear loops and they work great. For the price you can't go wrong with them. Just be aware that some animal ear loops are longer than others and may need modification.