Swim plugs and surfer plugs are designed to prevent water from entering the ear canal during swimming and surfing activities. Exposure to water can lead to bacterial infections like swimmer's ear or surfer's ear, which may cause permanent hearing loss. Swim plugs create a waterproof seal to block water entry while swimming, while surfer plugs also allow the wearer to still hear ambient sounds like waves. An audiologist can help select the appropriate type of ear plug based on the individual's water activities.