Mack's Pillow Soft® Silicone Earplugs, America's best selling earplug. Made from soft silicone, Mack's Earplugs are a powerful defence against low frequency, high volume snoring sounds. They mould easily to the ear forming a perfect fit. They don't crunch or crackle in the ear like some earplugs. These earplugs have a Noise Reduction Rating of 22 decibels.