Earmuffs Hardhat Clip-on NRR 26db. Ear muffs that easily snap into the side slots of standard hardhats (not full brim style). NRR value : 26dB SNR value : 23dB. Red POM headband with stainless steel reinforcement bars, red HIPS cup & soft PVC leather muffs. Meets ANSI S3.19.