Yurbuds Signature Series IX-1000 In-Ear Earphones Made in the USA or Imported FlexSoft, guaranteed never to hurt, yurbuds are ergonomically designed to avoid nerve rich areas of the ear for long-lasting comfort. Made with medical-grade, flexible silicone, they are ultra soft and comfortable for hours on end. Sweat Proof, developed for training in any conditions, yurbuds endure through rain, water, and sweat. TwistLock Technology, exclusive to yurbuds, our patented TwistLock Technology provides a secure fit that is guaranteed never to fall out even during the most rigorous physical activities. Allows Ambient Sound, yurbuds are ergonomically designed to allow in ambient noise so youre aware of your surroundings during active use. Woven Cords, for increased durability and portability, the woven cords are both tangle and tear resistant.