Sennheiser MX85 Sport Series II Twist to Fit Earbuds (Discontinued by Manufacturer) Twist to Fit locks the Ear Bud in place for consistant sound and fit Sennheiser BassWind produces clear, deep , rich bass. Sweat Proof Coating wicks mositure away enhancing fit and durablity Compatiblity with nearly every audio device with a 1/8 inch connector 2 Year parts and labor warranty