If you are the diver who is shivering at the safety stop while everyone else seems perfectly fine, you probably think you just “run cold.” You might even be considering buying a massive, bulky 7mm wetsuit for a tropical trip just to stay comfortable. Before you drop hundreds of dollars on thicker neoprene, there is a much cheaper, highly effective secret weapon you are probably ignoring: a high-quality scuba hood. Here is why covering your head is the absolute game-changer for cold divers.