Fabric Features: Full Seat Coverage, Stretch, UPF 50+ Sun Protection Enhancements: Fully Lined Bottoms feature RuffleButts signature ruffles UPF 50+ protects against 98% of harmful UV rays RuffleButts Flounce Bikini Styles We can't get enough of the Ruffle Bikini! The fun colors and patterns of this set make it a perfect swimsuit for all day fun in the water, especially because both pieces are fully lined.