The 3M Peltor X3 Ear Defenders are designed to offer protection against high noise levels. For example, forestry or heavy engineering. EN352-3 Fully adjustable SNR: 33d B Excellent comfort Soft black rings with foam The 3M Peltor X3 utilises a newly designed spacer to help improve attenuation without the need for a double cup design, thus increasing the space inside the cup for greater comfort & wearability