Adjustable Neck & Back Ties Frankies Bikinis' forte – and that shines through this bikini top. Inspired by the vibrant beaches of malibu, this triangle style is crafted from a water-resistant nylon blend, then covered in the brand’s rainbow gradient Serotonin print for a colourful look. Other features include an adjustable tie neck and back – so you can perfectly personalise your beach ‘fit.