Yurbuds Liberty 100 Bluetooth In-Ear Earphones Made in USA or Imported Flex Soft tips are ergonomically engineered to never hurt by avoiding nerve dense area within the ear for hours of comfortable listening By allowing ambient noise in, yurbuds Liberty Wireless provide awareness of your surroundings even during your run Twist Lock Technology keeps your headphones secured with a simple twist; Once in place, the earbuds are 'Locked' into place and won't wrangle free even during the most strenuous of exercises The three button inline remote doesn't interrupt your workout or training session when you need to take a call