O'Neill Girls Shortsleeve Rashguard: Swim Shirt 50+UV Surf Snorkel Scuba

So much better than a t-shirt over a swimsuit, rashguards can be worn in and out of the water. The lightweight yet dense weave dries quickly, breathes and keeps cool, yet blocks out harmful sun rays.

Note: These shirts are sized to fit very snugly. If your girl prefers a looser fit, order up at least a size or two from her usual size. To wear under a wetsuit, order her regular size.