The 3M Scott Safety Promask PP is available in 2 different sizes and will accommodate a wide range of facial shapes and sizes. The masks are positive pressure and feature a Butyl Rubber (ProcompTM) outer mask with reflex seal and silicone ori-nasal inner mask. The facepiece visor is single curvature and made of a scratch and impact resistant polycarbonate material with a flame-retardant coating and provides excellent panoraThe 3M Scott Safety Promask PP is available in 2 different sizes and will accommodate a wide range of facial shapes and sizes. The masks are positive pressure and feature a Butyl Rubber (ProcompTM) outer mask with reflex seal and silicone ori-nasal inner mask. The facepiece visor is single curvature and made of a scratch and impact resistant polycarbonate material with a flame-retardant coating and provides excellent panoramic vision. The visor is held in place by two U-shaped clamps.mic vision. The visor is held in place by two U-shaped clamps.