Silicone facepiece material conforms to facial features and doesnt harden with age. Silicone is easy to clean, durable and resists distortion. Contoured sealing flange and cradle suspension system eliminates discomfort caused by pressure points on facial nerves. Nose area design is comfortable and well-fitting. Minimal dead air space limits re-breathing of exhaled air. Direct cartridge-to-facepiece seal minimizes replacement parts and simplifies maintenance. Does not interfere with protective eyewear. (Shown with N75003 cartridges, cartridges and filters sold separately.)