Seafarers have long since begun to use lifejackets to given to crew in the event of a ship crash. Initially, these were rubber belts, and later, with the development of plastics, they would become much easier and cheaper. Today, such belts are filled with air, gas, or elastic neoprene foam.
With the development of sports sailing, life jackets appeared, which the crew of the boat wore during normal operation, to keep them on the surface in the event of a fall into the water. These vests are nowadays also widely used on fishing vessels as part of their work equipment, and on passenger ships are also available for crew and passengers.
As life jackets use only protect against sinking, special lightweight neoprene suits have begun to develop.
They were first used by cold cave speologists and high-speed rafters.
Such neoprene suits have multiple functions.
The first function is to keep a person on the surface of the water, thus protecting him from drowning.
The second function is to act as a thermal insulator, thus protecting the person from cooling in cold water.
A third function could be added to this if the outer layer of the suit were made of solid kelver. Such reinforced water rescue suits could also protect against attack by marine predators.
The disadvantage of such water suits is that they somewhat impede movement, so they are rarely used when working on fishing boats or cruise ships.
In addition to partially restricting movement in warmer locations, they can also cause excessive sweating.
To eliminate these flaws, such suits could be made with side solutions on the legs and sleeves that can be easily opened and closed, as is the case with ski suits.
In this way, opening these openings suddenly increases the breathability and does not overheat the person doing something.
In order to prevent sleeves and pants from interfering with normal operation, they can be made so that they can easily be partially inserted into special pockets on the chest or back of the suit, and thus transform the entire suit into a work vest.
Fishermen and sailors could use this vest in their daily work. Only by falling into the water would a man pull his sleeves and pants out of his pockets, into which he would slip his legs and arms and protect them from cooling by closing them. Additional reinforcement of the outer layer with kelver would also protect the suit from large fish, and would protect fishermen or passengers for hours in the most icy seas.