Disposable Respirator, 4400 Series, P100, Medium/Large. Exclusive easy-breathing wave design. Less resistance, better breathability. 99.97% efficient against oil and non-oil based particulates. FlexFit design moves easily with your face and stays in place. Dura-Mesh® shell resists collapsing in heat and humidity. Soft, cloth SmartStrap is both HANGABLE and ADJUSTABLE. Foam face cushion for added comfort and no pressure points. Ventex® valve lets the hot air out faster so workers breath easier and stay cooler. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 Section 7.11.1. 100% PVC-Free® and Metal-free.