PROVOKE Sports Earphones with XFit Technology for iPhone 4/3GS/3G, iPad, iPod Touch, iPod nano, Shuffle, Sweat Resistant Innovative XFit system keeps earphones comfortably in place even during rigorous activities Custom-designed speakers deliver sweet vocals and heart-thumping bass 4 sizes of ECO (Ear Canal Opening) rings work to fit individual ears Super soft, Tangle-resistant cables 2 Pairs of swappable Personalizers included