The RZ M2 Mesh Mask is our second-generation design, and the most popular mask in our lineup. Like all RZ Masks, it features our standard F1 filters, blocking 99.9% of particulates down to .1 micron in size. The M2 utilizes a highly breathable, comfortable, and durable mesh fabric construction that helps to keep you cool on even the hottest summer days. It features a single strap hook-and-loop closure, aiding in quick installation and removal of the mask.