Billabong Summer High Plunge Bikini Top. The Summer High Plunge bikini top is set to elevate your swim style with a plunging neckline that's all kinds of beach chic. Modern and sophisticated, this bikini top is designed in recycled polyester for the ultimate in sustainable style. Pullover fit with medium coverage. Plunge bikini top. Recycled polyester. No padding. Pullover design. Metal logo at back. 69% recycled polyester/23% polyester/8% elastane. Hand wash. Imported.