The RZ M2 Mesh is our second-generation design, and the most popular RZ Mask. It features a highly breathable, comfortable, and durable mesh fabric construction that helps to keep you cool on even the hottest summer days. The M2 face mask features a single strap hook-and-loop closure, aiding in quick installation and removal of the mask. Includes M2 mask, 4 F1 replaceable filters, two sets of spare valves, mask cleanser, storage bag, and user guide.