The Interval is the only waterproof iPod case designed just for swimmers! If you are an iTunes user, there is no better way to bring your own personal soundtrack into the pool. The waterproof case for the iPod shuffle 4th generation has integrated Surge 2G headphones and easily attaches to almost any swim goggle. Finally swimmers can have the same advantage of training with music that dry land athletes have enjoyed for years. Train harder, swim longer and have more fun doing it with the Interval 4G.