I'll check out, would get 2 pairs if found there. It is a must for every rider. Anything above 80dB sound is not good. Here are some stats for wind noise riding on bike;
100km/h = 94dB: Hearing Damage starts after 15 min exposure.
120km/h = 98dB: Hearing Damage starts after 07 min exposure.
140km/h = 102dB: Hearing Damage starts after 03 min exposure.
Routine exposure can cause irreversible hearing loss and can get continous ear-buzzing problem (tinnitus)