Highest independently tested NRR 33 for regular Meteors . Soft, slow recovery foam and contoured shape molds easily to the ear canal for all day comfort. The contours follow the shape of the ear canal which means less pressure at the smallest diameter of the ear canal. Meteors innovative undercut design affords a secure fit, all day long. Meteors are independently tested to ANSI S3.19-1974. Look for the Meteors bright green color as a symbol of Moldex quality. 100% PVC-Free, like all Moldex products & packaging - for a greener alternative.