Wikipedia
A dry suit or drysuit provides the wearer with environmental protection by way of thermal insulation and exclusion of water, and is worn by divers, boaters, water sports enthusiasts, and others who work or play in or near cold or contaminated water. A dry suit normally protects the whole body except the head, hands, and possibly the feet. In hazmat configurations, however, all of these are covered as well.
The main difference between dry suits and wetsuits is that dry suits are designed to prevent water entering. This generally allows better insulation making them more suitable for use in cold water. Dry suits can be uncomfortably hot in warm or hot air, and are typically more expensive and more complex to don. For divers, they add some degree of operational complexity as the suit must be inflated and deflated with changes in depth in order to minimize "squeeze" on descent or uncontrolled rapid ascent due to excessive buoyancy.
Dry suits provide passive thermal protection: They insulate against heat transfer to the environment. When this is insufficient, active warming or cooling may be provided, usually by a hot-water suit, which is a wetsuit with a supply of heated or chilled water from the surface, but it is also possible to provide chemical or electrically powered heating accessories to dry suits.
Usage examples of "dry suit".
Down in the cabin Maya got out of her clothes and pulled on a flexible orange dry suit: suit and hood, booties, tank and helmet, lastly gloves.
A wet suit gives us more freedom of movement than a dry suit that is pressurized by air tanks.
Harvard singsonged, peeling his own dry suit off his well-muscled body and nearly jumping into his jeans, pulling them on directly over the long woolen under.
He sat down heavily on a fallen tree and began pulling off his dry suit.
As he stripped off his sopping clothes and peeled off the dry suit, he glanced at his wrist to see how badly the cuff had abraded his skin.
As he turned around, the man who had addressed him lowered the M4 he had pointing at him, pulled off the strings of camouflaging kelp that were hanging from his dry suit, and stepped the rest of the way out of the water.
Zavala was already in his black-hooded Viking Pro military dry suit, and Trout was going over a checklist.
Even in his arctic dry suit the cold felt like a million sharp needles stabbing his skin.
Pitt gestured to the other diver, who was peeling off his dry suit.
He remembered the frigid waters penetrating his heated dry suit as he activated the timer on two hundred pounds of explosives.
The water was icy cold, but he stayed warm inside his DUI Norseman dry suit during the passages he was forced to swim.
Free of the cold water, the air temperature stood at a point where he was reasonably comfortable in his dry suit.