Soft energy absorbing foam offers a low equilibrium pressure making it one of 3M’s most comfortable earplugs Moisture resistant firm foam prevents swelling and the need to refit, keeping the plug in place particularly in warm conditions 3M proprietary slow recovery foam ensures a good custom fit inside most ear canals Reduces noise levels up to 28 dB Fully tested and approved against EN 352-9 Cylindrical design fits comfortably and offers an effective acoustic seal Textured surface helps them stay in place with jaw movement over long periods 250 pairs per box Compatible with 3M™ E-A-R™ One Touch™ Pro Earplug Dispenser. Refill bottles and bag available Available with probed feature for use with 3M™ E-A-RFit™ Dual-Ear Validation System