Moldex-Metric, Inc.'s 2730N100 particulate respirators incorporate the exclusive HandyStrap that allows the mask to conveniently hang down around the user's neck when not in use and the Ventex valve, which lets hot air out fast to enable workers to breathe easier and stay cooler. Featuring a soft foam flange for comfort, the 2730N100 is 99.97 percent effective against non-oil based particulates. Moldex-Metric, Inc., Culver City, CA.