zip onesie rashguardzip onesie rashguard Our Boy's Zip Up Rashguard is made of UPF 50+ fabric to protect your child from the sun's harmful rays, and the 87% nylon 13% spandex blend offers maximum flexibility, breathability, and comfort. The easy to use zipper and fully lined design make it perfect for all kinds of outdoor activities. Sizes 18 24M and smaller come with snaps for quick diaper changes. For lasting quality, machine wash on gentle cold and lay flat to dry.