4/3 mm wetsuit
A 4/3 mm wetsuit, also called a 4.3 or 4 mm is the most common thickness for a spring or autumn wetsuit. 4/3 mm refers to the main neoprene thickness used in individual panels which are stitched together to make a wetsuit. Usually the thicker 4mm panels are used in the main body panels for extra warmth and the 3mm thick panels are used in the more flexible areas such as arms, shoulders and back lower legs. The collar panel is often thinner than 3mm, but this is usually not mentioned in the thickness description of a wetsuit.
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