Halsey Black Bikini SetString theory but make it hot. This triangle bikini comes with all the ties you need to get the fit just right halter neck, back tie, and those side straps that hit different when you're poolside. Triangle bikini top with tie closure Halter neck tie Low rise bikini bottom Triple strappy sides on bottoms Polyamide, Spandex, Polyester Black Shown on a size XS.