These may work for some people, somewhere; but for me, they did not. I need hearing protection from loud machinery, and I need something for studying, something to drown out or muffle distractions. These were not usable for these purposes.
1. Effectiveness: Simply put, they hardly blocked any sound. They would, however, prevent low-velocity objects from flying into your ear.
2. Cushion: The black cushion isn't soft like the Peltor H9A Optime 98 Over-the-Head Earmuffs or the 3M 90561-80025T Tekk Protection Professional Hearing Protector, so it's neither as comfortable nor as effective.
3. Quality: Inexpensiveness, not quality, seems to have been the manufacturer's goal. I looked with a bit of suspicion at the materials.
4. Headband: The headband between the muffs is flimsy. It doesn't press the muffs against one's head with sufficient pressure to make an effective seal. (I have a slightly large head). Also, having had other earmuffs' plastic headbands snap in frigid weather, I wonder if this plastic band might meet a similar demise.
5. Folding mechanism: The folding feature is theoretically convenient, but it's an awkward process to fold and unfold them. While doing so, and simultaneously considering the previously-mentioned flimsiness, I worry that I might break them.