Mack's pillow soft silicone earplugs are the 1 selling earplugs in america. The ultimate in earplug comfort, mack's silicone putty molds to the unique contours of any ear. All mack's pillow soft silicone earplugs are doctor recommended to seal out water, help prevent swimmer's ear and provide protection after surgeries. Mack's are perfect for swimming, sleeping, showering, concerts, loud events and flying discomfort. Noise reduction rating; 22 decibels when used as directedthe range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 high numbers denote greater effectiveness.