Show your Boston pride and support for the Boston Marathon with the special Yurbuds Boston Edition Inspire earbuds. 10% of the proceeds from these special edition earbuds will be donated to the Challenged Athletes Foundation CAF to help support the ongoing recovery and lives of athletes. Patented Twist Lock technology: locks into place for a secure fit that never falls out, even under the most intense workout conditions. Ultrasoft and comfortable: ergonomically designed to avoid nerve rich areas of the ear made with medical grade silicone. Exceptional sound quality clinically proven acoustics provide deeper, richer sound. Designed to allow more ambient noise than most other earphones at the same volume level to help you stay safe. Rugged sweat and water resistant design ensures your music will always keep you going. Compatible with all smartphones, tablets, computers, and audio devices with a 18 in. 3.5 mm headphone jack. Neodymium magnet and dynamic driver 15 mm speaker 20Hz 20kHz frequency response. Includes sport carry pouch.