IMPRESSIVELY NOISE REDUCTION ABILITY & EAR PROTECTION: The high noise reduction level NRR 32 (Noise Reduction Rating) ensure to protect your hearing from loud noise, also you can leave the silicone ear plugs in your ears while you take a dive into a swimming pool and enjoy a few hours of the swimming session.SAFETY SILICONE MATERIALS: Made of high-grade silicone material, They are BPA free, washable, reusable, and safe to use,means that you can use them for as long as possible. Soft surface enables no paining or any discomfort. ANBOW earplugs will serve you for years.