Wetsuit

A wetsuit is a garment worn to provide thermal protection while wet. It is usually made of foamed neoprene, and is worn by surfers, divers, windsurfers, canoeists, and others engaged in water sports and other activities in or on the water. Its purpose is to provide thermal insulation and protection from abrasion, ultraviolet exposure, and stings from marine organisms.

It also contributes extra buoyancy.
The insulation properties of neoprene foam depend mainly on bubbles of gas enclosed within the material, which reduce its ability to conduct heat.
The bubbles also give the wetsuit a low density, providing buoyancy in water.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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