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How does a semi-drysuit work?

A semi-dry suit keeps a diver dry and warm by trapping a layer of water between his body and the suit. This way, a semi-dry suit is a great choice whenever a diver needs to keep his body temperature and make sure of not loosing it even if the temperature of the water in which he is changes. Dry suits and semi-drysuits are meant to maintain the diver’s body completely isolated from water by not allowing it to enter through any part of them.

The layer of water maintains the diver warm by isolating the cold water of the exterior from his body. Besides, that water trapped between the diver's body and the exterior absorbs warmth from the diver and this helps him to keep his body temperature stable. This makes it ideal for night diving or diving in cold waters in which keeping the body isolated from the environment might be vital.

It is important that a semi-drysuit fits the diver's body correctly. Otherwise, the water that is trapped between the suit and the diver’s body, and which has gained the same temperature than the diver's one, would be constantly replaced by new and cold water. This way, you should always make sure that the semi-drysuit you buy isn’t too big or too tight and fits you properly.

Semi-drysuits are usually made from closed cell neoprene. They also usually have neoprene ankle and wrist seals in order to ensure the proper isolation from the water. The more seals a semi-drysuit has, the better it will isolate the diver's body from the water's cold. Drysuits usually contain air instead of the semi-drysuits layer of water, and this is what makes drysuits much warmer than wetsuits or even semi-drysuits.

Just like most drysuits, semi-drysuits are used for buoyancy control. Therefore, if you wish to wear them you should have special training in order to be able to properly use this feature. This guideline applies for dry suits and semi-dry suits in general since the inherent buoyancy feature requires it, and you should not go into the sea wearing one of these suits without receiving the proper training on how to use them.

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