There are many types of drysuit's on the market each one suitable for its own purpose

A drysuit provides thermal insulation or passive thermal protection to the wearer while immersed in water and is worn by divers, who work or play in or near cold water. The dry suit protects the whole human body, except the head and hands. Dry suits are used typically in these cases:

• Where the water temperature is below 15°C (60°F).
• Extended immersion in water above 15°C (60°F), where discomfort would be experienced by a wet suit user

The main difference between dry suits and wet suits is that dry suits are designed to prevent water entering. This generally allows better insulation in dry suits making them more suitable for use in cold water. Dry suits can be uncomfortably hot in warm or hot air.
Dry suits for sport diving are made in both membrane and neoprene, and primarily differ from surface dry suits in that they have inflation and deflation air valves to maintain neutral buoyancy, and are slightly more durable.

Membrane
Membrane dry suits are made from thin materials, and thus by themselves have little thermal insulation.

Neoprene
Neoprene is a closed cell foam synthetic rubber, containing millions of tiny air bubbles, forming a buoyant and thermally insulating material.

Hybrid
Hybrid suits combine the features of both types, with a membrane top attached to a neoprene bottom near the waist.