Single Adjustable Strap: First of its kind NIOSH-approved single cloth strap with a Flexwing harness for an easier, comfortable, and custom fit. Ventex® Valve: Releases hot, humid air faster so you stay cooler and breathe easier. Dura-Mesh® Shell: Resists collapsing in heat, humidity, and regular use, making the mask last longer. No Metal Noseband: Maintains a secure seal with less pressure on the nose. Soft Foam Nose Cushion: Adds extra comfort.100% PVC-Free: Built free of PVC materials.