Uncorded earplugs seal the ear carnal with soft, slow recovery foam for excellent noise reduction and comfort; sort, pliable foam offers comfort over an extended time; low-pressure foam makes plugs less noticeable; easy to roll down for quick and easy insertions; pillow pack keeps each pair of earplugs clean before use; noise reduction rating (NRR) 33dB CSA Class AL; test compatible with "3M E-A-RFit" Dual-Ear Validation System.