Thicker neoprene makes a warmer wetsuit. Neoprene thickness ranges from 2mm for summer wetsuits to 7mm for extreme winter conditions. You’ve probably heard of a 5/4 wetsuit, a 4/3 wetsuit or a 3/2 wetsuit. These numbers represent the different neoprene thicknesses used in the different panels of a wetsuit. However, these numbers usually don’t tell the whole story. Typically, a 5/4 winter wetsuit uses neoprene in thicknesses from 2mm up to 5mm in different areas of the wetsuit.
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