For use in environments with high noise levels, protects up to 31 dB Noise Reduction Rating (NRR)
Work with KASK Super Plasma & Zenith helmets
Also designed to fit helmets that accept the Peltor/3M style ear muffs
*Adaptors Sold Separately* (ASIN: B017A7LPY0) but are included with the original Super Plasma Helmet packaging. With Zenith helmets the adaptors are built in