The HEAROS Supreme Softness Foam Earplugs are made in a proprietary formulation of polyurethane foam. The ear plugs have been tested and certified to provided a Noise Reduction Rating (NRR) of 32 decibels, which is the highest rating for foam earplugs. The hypoallergenic foam provides very comfortable and secure overall fit to prevent unwanted skin irritations. They are engineered to be a slightly smaller size to provide protection for those with a smaller ear canal. The foam ear plugs are to be used for all noise reduction and hearing protection purposes. Whether it is blocking out snoring, protecting your hearing at a concert, or trying to stay focused while studying, these are the perfect all around ear plugs.