The mask is comprised of high-quality, hypo-allergenic materials for maximum user comfort as well as resistance to chemicals. The face shield is composed of highly impact resistant polycarbonate (PC). Inner mask is made from non-allergic silicone - specially chosen for its chemical resistance. Because the inner mask is transparent, it is easy to identify the person wearing the mask. The Pro Mask offers an unobstructed field of vision. Wide T-bar sealing edge guarantees universal anatomical adjustment with minimum pressure on the face. The design of the inner mask reduces CO2 content within the mask to a minimum, thereby decreasing user fatigue and decreasing the visor from misting. Uses any standard 40mm NATO filter.