Alpine SwimSafe earplugs are designed to keep water out of your ears. That's pretty convenient when you spend all day by, on or in the water. The acoustic filters in the SwimSafe earplugs ensure that ambient sounds and conversations remain audible. The very small opening in the filters prevents an air-tight feeling and the shape of the earplugs prevents water from entering the ears. SwimSafe earplugs are suitable for use underwater.