Large size fits my 10 year old son, there is room for growth. (4 feet 9 inches, 77 pounds). To be honest I could buy a medium sized one and it would probably fit me just fine, but since my child seems to be outgrowing his clothes, hopefully I can go two years without this shirt if I buy one. it's a little bit more. The shirt perfectly protects it from the sun and UV rays. He's been in the sun all day with no sunscreen under his shirt and no signs of sunburn! In fact, I'd say the shirt worked better than the sunscreen as his arms and face were tanned but his torso wasn't. lots of stuff floating around to make it look like an underwater sail. I have an adult version of this shirt and it has lasted 2 years with no problems. I feel like my son outgrows the shirt before he can wear it.
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