Solo Universal Headband-Type Ear Muff with Soft Foam (2 set) FEATURES: Black Cup & Red Hoop with Soft Foam Filled with Cushion for All-Day Comfort. Designed For High-Noise Environment & Low-Frequency Sounds. The combination of a specially designed spacer and cup helps to Provide Excellent Protection against low-frequency Noise. NRR 26 dB SNR: 32 dB