I received the XL (claimed size 12) for my 10 year old grandson. He wore the 10's for a year so I found the 12's safer. In terms of width and length, size L (10) would fit him better. But thanks to the elastic waistband, he can now wear it and grow in it. Otherwise they are perfect for the two weeks of cold weather we get here on Florida's Gulf Coast. I think they look fun and he thinks they're comfortable.