The world’s most-used polyurethane foam: the highest attenuation in a single-use earplug and - SNR 37 One-size-fits-all, non-corded, orange colour, pack of 200 pairs Contoured bell shape, which is easy to insert and resists tendency to back-out of ear canal Polyurethane foam enhances comfort, especially for long-term wear. Smooth, soil-resistant closed cell-foam skin prevents dirt build-up Personal Protective Equipment that conforms to the provisions of the PPE Directive 89/686/CEE - standards EN352-2:2002 - Max: SNR 37 - 36H - 35M - 34L