The OMX 80 Eco is part of a series of sport headphones from Sennheiser that is packaged in bio-degradable materials to minimize the carbon footprint of the user. This acclaimed customizable earclip headphone is sweat-proof and rinsable under running water for the ultimate in usability and durability. The earclips are individually bendable in an infinite number of combinations for a snug fit that won't budge during a tough workout. How do they sound? They're from Sennheiser! The Basswind system delivers clean, clear bass and the included ear adapter set keeps the specially tuned ear speaker close to the ear for optimum audio quality. A cable clip keeps the asymmetrical cable in place during heavy activity. They are cold-weather tested for use indoors or out. Built-tough with a 2 year warranty.