SurfEars 4.0 lets sound in while keeping water out. Designed by Swedish surfers and engineers, it utilizes unique acoustic mesh. This blocks water, cold air, dirt, and bacteria known to create ear inflammation or bone growth. The core contains 91% post-consumer recycled plastic. Also features a fused core and mesh for improved toughness and durability. Its modular design allows wear with or without wings, expanding range of use.