5/4 mm wetsuit
A 5/4 mm, also called a 5.4 or 5 mm is a common thickness for a winter wetsuit. It is slightly warmer than a 5/3 mm wetsuit due to the extra mm thickness in the arms. 5/4 mm refers to the main neoprene thickness used in individual panels which are stitched together to make a wetsuit. Usually the thicker 5mm panels are used in the main body panels for extra warmth and the 4mm thick panels are used in the more flexible areas such as arms, shoulders and back lower legs. A 5/4 mm wetsuit is made of 5 and 4 mm thickn panels. 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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