NWT Summersalt Black & White One Piece Swimsuit The Tie Waist Backflip. Size 4 Make a splash this summer in this eye catching colorblock The Tie Waist Backflip Swimsuit from Summersalt. This super flattering one piece is padded and has a front waist tie, plunging v-neck, and open back. Toss it on under a beach coverup, or soak in the rays out on the beach or on a fun cruise.