My son just turned 7 and I believe he is 7.5-8 years old (51 inches and 60 pounds). I ordered xs but it was too small so i ordered small and it fits great. He can even get away with an M with his sleeves rolled up. These shirts are so good for outdoor sports and game shifts. My son loves everything under the armor but he LOVES them too and I was able to get so many colors!
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