Its not often I so easily give 5 stars. Decent comfort when wearing for most or all of the workday. The insides are big enough to allow earbuds to be worn underneath - still with a good seal for noise protection or in my case eliminating the unwanted sounds of coworkers in the office when I need to concentrate.
Long story short, after five months my pair broke - the plastic band snapped in two. I decided to contact 3M to ask about warranty. No questions asked, they mailed me a free pair of their even better model 3M Peltor (even more comfortable and better noise protection). They also mailed a prepaid mailing label so I could return the broken pair for their quality labs to look into why they broke. This all happened within ten days - they were very friendly and responsive and the effort on my part was 2 emails. Who can ask for more than that from a company? I'm on my second pair of Tekk earmuffs at work, and I kept the free Peltor earmuffs to use at home. My second pair is still going strong, and I know if there is a problem this company will stand behind the product.