Billabong Sandy Day Bralette Bikini Set. Bright, beachy, and ready for all-day play—the Billabong Sandy Day Bralette Bikini Set brings bold style to the shore. This girls’ set features a bralette-style top with colorful, colorblocked stripes and adjustable straps for a comfy, stay-put fit. The matching full-coverage bottoms keep things classic, while the fully lined design ensures all-day comfort. Made to handle both saltwater and chlorine, this suit is perfect for sunny beach days, pool parties, and everything in between. 82% Polyester 18% Elastane. Lining: 92% Polyester 8% Elastane.