Bring the heat with our Ruler Bra Sized Underwire Bikini Top! This sun-worthy bikini top is bra-sized for your best fit. Simply choose your size the way you would your favorite bra for the most comfortable and supportive fit ever. Built-in underwire molded bra cups have Power Mesh for extra bust support. Pair this bikini top with our Hipster Swim Brief or any of our fit-to-flatter swim bottoms. Side boning Built-in underwire molded bra cups with supportive Power Mesh for extra bust support Adjustable straps Snap closure at back To close clasp: interlock ends in X-shape & lock by firmly pushing ends down together. (Keep as is!) To open: hold sides of closed clasp & push inward on center. Slide one side upward & other piece down. 82% Nylon / 18% Spandex Fabric provides UPF 50 UV protection. See details . Hand wash with mild soap. Roll suit in towel & squeeze out excess water. Dry flat; avoid washers & dryers. Imported Solutions: Underwire, UPF 50 Sun Protection Choose your band/cup size like you would your favorite bra! This style is available in cup sizes up to F/G cup! Click here to shop matching brief. Close Back Details “UPF” stands for Ultraviolet Protection Factor and it measures the Ultraviolet radiation or “UV” protection from the sun provided by a fabric. (Similar to the SPF rating system used for sunscreens.) Our Swimsuits For All styles with UV sun protection have a rating of UPF 50 (the highest possible rating) which means only 1/50th of the sun’s UV rays can pass through, and it blocks 98% of UV rays. Sunscreen use is still recommended when wearing our UPF 50 styles since no clothing can completely block out UV rays. Please note that most fabrics lose some of their UV protection over time from repeated washing and wearing. Garments that are damp or wet typically provide less UV protection (this is especially true of lighter fabric colors). Also, on any UPF 50 suit that had mesh or other fabric panels, those panels would not provide the same UPF 50 protection.