Understanding Wetsuit Thickness: 4/3 vs 3/2 vs 0.5mm

Have you ever wondered what it means when someone says they wear a 4/3 wetsuit? We get asked almost every day how thick the neoprene in our wetsuit-lined boardshorts are (they are 0.5 or 0/0.5mm), because understanding neoprene thickness is incredibly important to watermen.

To start, wetsuit thickness is measured in millimeters and is typically indicated by two numbers separated by a slash, such as 4/3 or 3/2. The first number refers to the thickness of the neoprene material used in the torso and upper body, while the second number refers to the thickness of the material used in the arms and legs.

A 4/3 wetsuit means that the neoprene in the torso and upper body is 4 millimeters thick, while the neoprene in the arms and legs is 3 millimeters thick. This is typically used for colder water temperatures and offers more insulation and warmth.

On the other hand, our wetsuit-lined boardshorts are considered 0.5mm or 0/0.5, because we have one layer of neoprene that is the same thickness stitched into the outer boardshort layer. 0.5mm is a good thickness for spring, summer or early fall where the water is a little cooler. Our neoprene thickness allows you to stay out in the water longer in boardshort weather while also protecting you from chafing.

When comparing wetsuit thicknesses, it's important to consider the water temperature and the individual's comfort level. A thicker wetsuit may provide more warmth but may also restrict movement, while a thinner wetsuit-liner like in Drifties, might not be worn in the winter, but are perfect in warmer waters and will provide more flexibility.