Mack's SafeSound Ultra Earplugs are molded with state-of-the-art super low-pressure, skinned and tapered foam. Provide unmatched comfort., Molded with state-of-the-art super low-pressure, skinned and tapered foam, Provide unmatched comfort and improved hygiene., High noise reduction rating (NRR) - 32 decibels, For loud concerts, motor sports, sleep, shooting sports, power tools, etc.