Use them (with sun hats) as sun protection, don't give your kids TOXIC chemicals! Fits my little 7 year old frame. large. However, it will grow out above the ground. The bottom covers his knees when he's standing and so does a good job of blocking out the sun when he's out of the water. The top fits like any rashguard/swim shirt. Tops that are too loose are DANGEROUS and ineffective in the swim (bottoms just stay pressed against the skin most of the time, but the flexible sleeves move forward to create a "parachute" effect during the stroke), so I'm glad that the designer has chosen the size use in the water. .
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