NIOSH certified to have a filter efficiency of 95% or greater for non-oil based particulates. HandyStrap® allows mask to conveniently hang down around the user's neck. You’ll find it’s a convenient place to keep it when you’re not using it. And during wear the elastic cloth strap feels comfortable and cool. The exclusive Dura-Mesh® shell protects the filter media so it stays cleaner-looking longer. The shell also resists collapsing in hot, humid environments so the respirator holds its shape longer. The result is fewer respirators used and lower costs. Easier to wear and more all-day comfort for the majority of the work force. Contoured nose bridge with a soft foam nose cushion for comfortable seal. Comes without a metal noseband to adjust. Exclusive Ventex® valve lets the hot air out faster so breathing resistance is reduced and workers stay cooler. Med./Large.