The Radians Maximus Earmuff has a hearing protection rating of NRR 28. When combined with the included Deflector Foam Earplugs with a hearing protection rating of NRR 33 you get an estimated combined rating of NRR 38. If you are shooting at an indoor range double hearing protection is always a good idea.

Radians Maximus Earmuff with Earplugs Specifications and Features
Radians Item Number VX0100CS
Earmuff NRR 28
Earplugs NRR 33
Combined Estimated NRR 38
Comfortable Full Size Hearing Cups
Premium Padded Headband
Black