3M Pro-Protect Wireless Electronic Hearing Protector with Bluetooth Technology, NRR 25 db 90545H1-DC-PS - The Home Depot
3M Pro-Grade Noise-Reducing Earmuff, NRR 30 dB, Lightweight and Adjustable, Black, One Size - Amazon.com
3M Peltor H6AV Optime 95 Over the Head Noise Reduction Earmuff, Hearing Protection, Ear Protectors, NRR 21dB, Ideal for Machine Shops and Power Tools, Beige - Industrial Test
3M H9A PELTOR™ Optime™ 98 Black / Yellow Over-the-Head Earmuffs