My son is 8 years old. I find 10-12 medium size, a little big in length, but the system can grow, he can wear them a few years they came time very good product made Good! I will buy this product again and again! Yesterday my son helped me with the shovel and played in the snow, during the breaks he played in the snow, they didn't even get wet! He really likes the yellow so we ordered it and are still waiting for the jacket because it wasn't the best! But I recommend them and if you want them to last a few years make them a little bigger and with the length extender feature they will last even longer! Most people go black but I choose a different color so it never gets confused with other kids at school because things can get lost! Great for our cold Wisconsin weather! If you have any questions please leave a comment, I will answer any question you have, by far the best winter pants I have ever bought! Diana M
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