3M X5P3E Peltor Black Model X5P3E/37279(AAD) Cap Mount Hearing Conservation Earmuffs, English, 14.573 fl. oz, Plastic, 4.6" x 8.2" x 6.7": Amazon.com: Tools & Home Improvement
Defender Safety H1 Helmet Attachable Ear Muffs, 24dB ANSI Ear Protection for Construction with Hard Hat Mounting Adaptors. Fits H1-CH and Most Hard Hats - Amazon.com
Bluetooth Hard Hat Ear Muffs, NRR 28dB Adjustable Cap-mounted Ear muff, Helmet Attachable Earmuff, Black - Amazon.com