Polk Audio's new UltraFit Sports Headphone Series is the rethinking from the ground up of performance, comfort and durability-the three characteristics serious athletes (and active individuals) need most in a pair of headphones. Serious music lovers too will value the UltraFit Series because of its undeniably impressive sonic performance.The UltraFit 3000 is an in-ear canal design that offers the highest sonic performance and the highest level of...