Are you struggling to stay warm in your 5mm suit? Then you should definitely try out the warming comfort of the Thermo-X Neoprene hoodie. It has a low profile fit that makes it useable underneath wetsuits as a base-layer.
The material used for this is the Thermo-X HyperDry from O'Neill. This provides you with good insulation, minimal water absorption and a hoodie that is coated with DWR material.