Suit Assembly History
The first suits used traditional sewing methods to simply overlap two strips of rubber and sew them together. In a rubber wetsuit this does not work well for a number of reasons, the main one being that punching holes straight through both layers of foam for the thread opens up passages for water to flow in and out of the suit. The second problem is that the stretching of the foam tended to enlarge the needle holes when the suit was worn. This meant that a wetsuit could be very cold all along the seams of the suit. And although the sewn edge did hold the two pieces together, it could also act as a perforated tear edge, making the suit easier to tear along the seams when putting it on and taking it off.
When nylon-backed neoprene appeared, the problem of the needle weakening the foam was solved, but still the needle holes leaked water along the seams.
Read more about this topic: Wetsuit
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