Hydro Seals utilize an advanced multi-baffle polymer design providing exceptional protection against water entering the ear canal. In addition to greatly reducing the chance of infection by inhibiting bacteria from growing in stagnant inner-ear water, Hydro-Seals also help prevent the temporary loss of equilibrium. Simple and effective to use, Hydro- Seals reduce the chance of surferâ€TMs ear by sealing out cold air and water, which causes exostosis. Exclusive Hocks Noise Braker allows normal sound waves to pass through while preventing pressure build-up from water intrusion, making them ideal for divers that have trouble clearing their ears at descending depths.