Wetsuit

in a wetsuit.]]

A wetsuit is a protective garment used for Watersports such as Scuba Diving , Surfing , Windsurfing , and Triathlon . A modern wetsuit is mostly made from thin Neoprene , which provides limited thermal protection for activities in cold water. It is usually lined with a nylon fabric to strengthen it and make it easy to put on and take off. Some newer wetsuits, usually marketed as "superflex," contain spandex in addition to neoprene to allow the suit to stretch (the panels of a wetsuit of this type typically contain 15-20% spandex). This counteracts neoprene's tendency to shrink with age; it also allows for some changes in the wearer's size without making the suit uncomfortable.

Wetsuits help to preserve body heat by trapping the water that has been warmed by body heat so it cannot escape and take the heat with it. Water has a very high thermal conductivity so heat is lost very quickly to the surrounding water. Without a wetsuit, the movement of water over skin would constantly wisk warmth away from the body. Wetsuits are made out of neoprene, a synthetic rubber that contains small bubbles of nitrogen gas when made for use as wetsuit material. Nitrogen gas has very low thermal conductivity, so it does not allow heat from the body (or the water trapped between the body and the wetsuit) to be lost to the water outside of the wetsuit. A wetsuit must have a snug fit to work efficiently; too loose a fit will allow water to escape fom between the suit and the body, taking the body's heat with it. Flexible seals at the suit cuffs aid in the water retention. The suit loses buoyancy and thermal protection as the bubbles in the neoprene are compressed at depth.

HISTORY

It is difficult to credit a single individual for the creation of the modern wetsuit. In 1951 , while working for the US Navy , Hugh Bradner had the insight that a thin layer of trapped water could act as an insulator. It was a colleague of Bradner who suggested neoprene as a feasible material. However, Bradner was not overly interested in profiting from his design and never marketed a version to the public; nor did he patent his design. The first written documentation of Bradner's invention was in a letter dated June 21 , 1951.

Traditionally, most say it was Jack O'Neill (businessman) who invented the wetsuit and started using neoprene, which he found lining the floor of an airliner. However, this is disputed by some aviation experts because neoprene and other rubbers are not fire retardant; therefore, they would not be found on any passenger aircraft. O'Neill went on to found the successful wetsuit manufacturing company called ''O'Neill'' . But Bob and Bill Meistrell, from Manhattan Beach, California , claim to have started experimenting with neoprene around 1953 . Their company would later be named Body Glove .

TYPES

Wetsuits come in different thicknesses depending on the conditions for which it is intended. The thicker the suit, the warmer it will keep the wearer. A thick suit is stiff, so mobility is restricted. A wetsuit is normally described in terms of its thickness. For instance, a wetsuit with a torso thickness of 5 mm and a limb thickness of 3 mm will be described as a "5/3". Some suits have extra layers added for key areas such as the lower back.

Different shapes of wetsuit are available, from the "shorty" that covers the torso and has short arms and short legs; the "jacket" covering the torso and arms; the "long johns" that covers the torso and legs only; and the "full suit" or "steamer" that covers the torso and the full length of the arms and legs. Some suits are arranged in two parts; the jacket and long johns can be worn separately in mild conditions or worn together to provide two layers of insulation around the torso in cold conditions. Typically, cold water wet suits have 12 to 15 mm of material around the torso and 6 to 8mm for the extremities.

Usually they have no feet or hood, and the diver must wear separate Bootee s and hood made from wetsuit material.

Using hoods: in the thermal balance of the human body, the heat loss over the head is at least 20% of the whole balance. Thus, for the sake of thermal protection of the diver, wearing a well-fitting hood is good practice, even at fairly moderate water temperatures.

A specialised kind of wetsuit, with a very smooth (and somewhat delicate) outer surface is used for long distance swimming and triathlon. These are designed to maximize the mobility of the limbs while providing both warmth and buoyancy.

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Wetsuit