This Long John is made of 1.5 mm breathable Airprene material that allows your skin to breath and prevents the feeling of overheating. There is a regular part of Neoprene below the knees to protect them from the cold water. We tried to give this product an extra detail, the stretchable net on the back, designed specifically for enabling more free movement in the shoulder area. Wide openings for your arms ensure that you don’t scratch your skin on the material while paddling.