3m earfits foam ear plugs these 3m ear yellow ear plugs help to block out the noise and provide audio protection whether youre studying for exams working in a noisy environment or just need a good nights sleep these earplugs will help to provide that well needed moment of peace they are manufactured in polyurethane foam providing great comfort and good protection the earplugs are made to one size fits all suitable for the majority of auditory channels once inserted into the