The Kirby Morgan Band Mask KMB 18 A/B can be used in deep mixed gas diving as well as shallow water diving. The SuperFlow demand regulator provides low inhalation resistance and high gas flow letting the diver breathe easier and work harder with less exertion. The communications connection can be either a waterproof plug in type or bare wire posts. Waterproof type is required when a "round robin", or diver/tender "both mics on" comm system is used. The Side Block assembly can be configured to receive the umbilical either from the front of the diver (18-A) or over the shoulder (18-B). The mask frame is made of hand laid up fiberglass, which provides a heat/cold barrier as well as being an excellent electrical non-conductor. The head harness is neoprene rubber, resistant to tearing. The hood provides pockets for the earphones, warmth for the divers head and attaches to the mask frame with welded stainless steel bands.