I bought M (5-8) and they are VERY difficult to put on but once on they fit perfectly, they are long enough and have little elastic cuffs at the bottom to put on the heels so they are under booties. She LOVES kittens and warm, soft interiors. Some people say she's too small, but she's 85th percentile for height (48 inches) and 30th percentile for weight (46 pounds) - we've just been to the pediatrician so I know! - and they are perfect. However, she is only 6 years old. By the age of 7, she may need to increase in height. But if you have a tall 5-6 year old skinny kid they are perfect. Just remember that getting dressed takes a lot of effort! It's been very cold here (for our area) and they keep you warm in 40 degree weather - I can't vouch for temperatures below that. We love it!
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