The proven 3S style is now even more comfortable. The chin body is made from a special rubber compound and is even softer than before. The wider sealing flange and deeper chin pocket provide a size-appropriate, comfortable and well-closing fit on the face. The 3S mask is also available in silicone rubber. The visor is made of polycarbonate material, has a non-moisture finish and is secured to the facepiece by a two-piece plastic frame. The wide field of vision is an additional positive feature for safety. The exhalation valve is located at the lowest point of the mask. The large cross section of the valve provides low exhalation resistance. The exhaust