Special Ops® Series has solid black color that stays cleaner looking longer. NIOSH certified efficiency level of 95% or greater against oil and non-oil based particulate aerosols up to 10x PEL. HandyStrap® allows mask to conveniently hang down around the user's neck so it’s always ready for use. And during wear the cloth strap is more comfortable and cooler. Exclusive Dura-Mesh® shell protects the filter media so it stays cleaner looking longer. Plus it resists collapsing, even in heat and humidity so the respirator holds its shape longer. The result is fewer respirators used and lower costs. Exclusive Ventex® valve lets the hot air out faster so breathing resistance is reduced and workers stay cooler. Med./Large.