We bought this for our 5 year old son to wear while playing in the snow to avoid getting wet/ruining his winter coat. He turned 5 at the end of November and has between 4 and 5 pants so we didn't know how to order for him but this size worked great. It's big enough that he can use it next year, but not so big that it feels bulky or unportable this year. Great for a 5 year old - although not sure I would put it on a 6 year old. We actually ordered the next size up (7) for our 6 year old and it worked great. Durability: We live in Buffalo, NY and he plays in the snow a lot and this suit has worked well. He is warm, happy and the suit is still in good condition. will last another year.
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