America's original and #1-selling moldable silicone earplugs. Mack's Pillow Soft Earplugs mold very comfortably to the unique contours of any ear. The Doctor's choice for sealing out water (helps prevent swimmer's ear) and reducing noise with a noise reduction rating (NRR) of 22 decibels. For swimming, sleeping, studying, bathing, work, travel, loud events, flying discomfort, etc. Shatterproof carrying case included.