What is a racerback bikini top?

A racerback bikini top is a type of swimsuit top that has a strap or band of fabric that runs between the shoulder blades and creates a "racerback" shape at the back of the top. The straps may be adjustable or non-adjustable and may be made from a variety of fabrics, such as nylon, spandex, or polyester. Racerback bikini tops can have a variety of styles and fits, ranging from triangle cups to balconette cups, and may have features such as underwire, padding, or hook-and-eye closures for added support and shaping. They can be paired with a variety of bottoms, including briefs, thongs, and boyshorts, to create different styles and levels of coverage. Racerback bikini tops are a popular choice for women who want a sporty, athletic look or who want to add visual interest to their swimsuit.