Doctor's Choice for Sealing Out Water and Reducing Noise. Maximum Comfort. Helps Prevent Swimmer's Ear. Protecting Hearing from Loud Noises (Noise Reduction Rating 22 dB). The original and exclusive formula made with non-toxic, hypoallergenic silicone putty. Molds to the unique contours of any ear. Snore proof and waterproof in a new, easy-to-open shatterproof case.