This is, perhaps, the most common type of equipment used in professional diving, and the one most recognised by the public. Surface-supplied equipment can be used with full face masks or diving helmets. Helmets are normally fitted with diver to surface communication equipment, and often with light sources and video equipment. The decision between wearing a full-face mask or a full diving helmet comes down to job requirements and personal preference, however the impact protection and warmth offered by a full diving helmet makes it popular for underwater construction sites and cold water work.