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Great rash guard sun protecting swim top. Love the purple color - matches the purple Kanu stripe bathing suit perfectly. Ordered a 4T and it is a little big (not a bad thing - maybe last a couple of swim seasons). Daughter wears a 4T in street clothes (32 lbs and 40 inches tall). I would recommend if you wear a 4T that you pick the 4T and be prepared for it to be a little big. Arms were a little long and sits below the waist line. I just roll up the sleeves. Glad we bought it.
I really like this product and it worked well for my daughter. However, if you are sizing it based on "normal clothes", they are massive compared. I would go at least two sizes lower than what your child wears for clothes. However, I am very pleased with his product.