TwistLock® 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. Inspire for Women ear buds are designed with heavy workouts and intensive exercise in mind. Sweat and moisture won't hold you back from your goals, and it should not affect your headphones. Designed to allow more ambient noise than most other earphones at the same volume levels. This keeps you safe and aware of your surrounding while still committing 100% to your workout. Ergonomically designed to avoid nerve rich areas of the ear. Made with flexible silicone, yurbuds are ultra-soft and comfortable for hours on end.