The Hyperflex Juniors rash guard a fantastic all year round UV shirt for boys and girls. Designed for a snug fit for wearing at the beach or even layering under wetsuits. Provides 30 UV, rash and jellyfish protection (UV rating varies by color of actual shirt. The darker the color of shirt, the better the UV rating). These shirts are a great first layer under wetsuits or a great stand alone shirt for the beach, lake or pool.