Smooth-skin is the warmest and lightest material for surfing - period. It neither absorbs water or allows the wind to pass through it. That means you are lighter and you dont use energy pulling water around thats trapped in your wetsuit nylon. You cut through the water like a seal and any sunshine warms the surface of the neoprene as it stays dry - all the time. Genius? Not really - its the original way of making wetsuits before people tried to turn them into profit making, brand advertising, techno whatevers. Simple, Warm & Smooth.