5/4/3 mm wetsuit

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A 5/4/3 mm, also called a 5.4.3 or 5 mm is a common thickness for a winter wetsuit. It is similar to a 5/4 or a 5/3 mm. 5/4/3 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 chest and back panels for extra warmth. The 4mm panels are often used in the upper legs, while the 3mm thick panels are used in the more flexible areas such as arms, shoulders and back lower legs. A 5/4/3 mm wetsuit is made of panels that are either 5, 4 or 3 mm thick. 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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