Extreme Performance, Fit and Comfort. UltraFit 3000 is the most extreme high performance sports headphone system ever. SecureFit Support design wraps the bud around your ears, for the most stability even during rough play, while Moisture shield technology wicks away sweat. Pick the custom eartip that fits the best, for a snug (yet comfortable) deep ear-canal audio experience. On-the-fly controllers, two custom cable lengths, as well as superior material durability, make the UltraFit 3000 the last sports headphone you'll ever need. Need we mention the ultimate motivation: high performance Polk sound? Didn't think so.