Wet suits are made of closed-cell foamed neoprene and are 3-12 mm thick. They prevent the body of the diver from overcooling and minor injuries such as those caused by pricking on corals. The neoprene suit consists of pants, jacket, boots, gloves, hood and vest. It also might be a cami-knickers. Wet suits can be used when diving in water no colder than 15,6 C degrees.
Some suits have an inner layer of nylon which prevents them from tearing and makes them easier to be put on. The disadvantage of the wet suit with nylon is that if cold water enters it, it might cause a chill to the diver.
The thicker the neoprene is, the warmer it keeps. However, thick neoprene makes the movements of the diver more difficult.
Dry suits are made of waterproof materials and worn over a wet suit or other warm-keeping clothing. The dry suit can be filled with air through special valves. It also can be emptied through an exhaust valve. Well-trained divers can control their buoyancy by controlling the suits valves. The dry suit is used for cold water diving when the temperature is near the 0 C degrees.
Below you can see a type of diving dry suit which is worn in dirty, toxic waters. It consists of a helmet, attached to the main dress by means of a clip. This piece of divers clothing is used to avoid direct contact with water. It also protects industrial divers from injuries during their work with instruments and tools.
Variable-Volume Neoprene Suit
These suits are the same as the dry suits but they are made of closed-cell foamed neoprene with an inner and outer layer of nylon. They are used in the same way as the dry suit but in colder waters.
Open-Circuit Hot-Water Suits
Open-circuit hot-water suits use hot water to prevent the diver from chills. The hot water has the same effect as the hot-water bottle. Water flows through small tubes and keeps the body warm. When the water gets cold, it leaves the suit through a valve. The open-circuit hot-water suit is made of passive insulation materials.
Closed-Circuit Hot-Water Suits
These suits are the same as the open-circuit hot-water suits but use a definite amount of water which circulates and is constantly rewarmed.
Did you know...
Military divers use closed-circuit scuba during secret operation because the exhaled air is rebreathed and no air bubbles are released in the water.