From the Manufacturer The Choice of 75% of the World's Top Touring Musicians* The world's top performing artists choose Ultimate Ears custom in-ear monitors for one reasonthey are made to deliver the best fit and sound reproduction available. Ultimate Ears represents the culmination of years of experience designing, testing and refining professional in-ear monitors. Ultimate Ears brings this experience to every pair of earphones that they make. The unique sound signature of Ultimate Ears earphones has been tuned to be sonically accurate, yet musically impressive.