Made of an extremely soft non-allergenic elastomer for comfort and fit. Contoured sealing flange eliminatesdiscomfort caused by pressure points on facial nerves. Design of nose area provides excellent comfort and fit. Low dead air space improves worker comfort by limiting re-breathing of exhaled air. Direct cartridge to facepiece seal minimizes replacement parts and simplifies maintenance. Three overlapping sizes comfortably fit most users. North 5500 Series Half Masks are compatible with all North cartridges, filters and accessories.