Pioneer SE-CL331-L Headphones, Blue (Discontinued by Manufacturer) The first truly water-resistant headphone, the SE-CL331 can tackle the elements. Be it rain, snow, sweat or dust, the SE-CL331 are designed to keep up with your active lifestyle. 4 interchangeable ear tip sizes, an ergonomic holder and a cord clip ensure a secure fit, even during active use like running. 9mm noise-isolating drivers provide big sound in a compact design.