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You can retrofit the Protos with 3M ear defenders, if you change the attachment brackets.. Takes them up to 32snr. https://www.gustharts.com/clothing-ppe-c32/helmets-accessories-c33/hearing-protection-c101/protos-32snr-ear-defenders-bracket-bundle-p2723

I have the vertex vent and the protos - both are good, the protos being more comfortable and better made imho. I absolutely hate the Kask -the foam padding makes them hot and smelly.