Highlights Unique suction port streamline design makes breathing easier and more comfortable 3M Cool Flow valve unique design, lower expiratory resistance, making breathing easier and more comfortableThe bonnet is made of heat-resistant plastic, which can guide the exhaled gas and moisture to drain downwards, helping to make the breathing cooler and more comfortableAdvanced silicone material and soft sealing ring design, make the face feel softer and more comfortable, help reduce the pressure and creasing of the face, providing excellent comfort3M™ HF 50 Series Silicone Half Facepiece Reusable Respirators are China SAWS and Korea MOEL approved and designed to help provide respiratory protection against certain airbone contaminants.