This Rokka & Rolla Boys' Quick Dry Swim Trunks with Mesh Lining, UPF 50+, Sizes 4-18 is your must have beachwear essential. The boys' 4-Way Stretch board shorts are equipped with UPF 50+ for enhanced UV sun protection. With breathable, stretch fabric to allow your boys to remain lightweight when swimming. These boys' swim trunks have an elastic-drawstring waistband to help secure tightly when performing rigorous activities. With quick-dry microfibers to help improve the water-resistance in the mesh lining swimsuit.