Moldex® 2730N100 Series particulate respirator with HandyStrap® is 99.97% effective against non-oil based particulates. HandyStrap® allows mask to conveniently hang down around the user's neck so it’s always ready for use. And during wear the adjustable cloth strap feels comfortable and cool against the skin. Exclusive Ventex® valve lets the hot air out faster so breathing resistance is reduced and workers stay cooler. 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.