Billabong Last Summer Triangle Bikini Top. The Billabong Last Summer Triangle Bikini Top is a breezy, barely-there style made from partially recycled nylon for a feel-good take on a flirty favorite. Designed with very skimpy bust coverage, it features classic triangle cups with adjustable O-ring straps and back ties so you can customize the fit just the way you like it, while removable padding lets you choose your level of shape and support. Contrast piping adds a bold, sporty edge, and subtle logo embroidery keeps the look clean and elevated — perfect for sun-soaked days when less is more. 78% Recycled Nylon 22% Spandex. Lining: 92% Recycled Polyester 8% Spandex. Hand wash. Imported.