Soft, uncorded earplugs conform to the unique shape of each ear for excellent hearing protection and comfort. Tapered design fits comfortably in the ear canal and offers a smooth, dirt-resistant surface for hygiene. Earplugs are made of soft, hypoallergenic foam. Noise Reduction Rating (NRR) is 29 decibels. CSA Class AL. Earplugs are test-compatible with 3M E-A-Rfit Validation System.