A dive hood is required to wear when the water temperature is below 24°C.
Some divers prefer to use their wet-suit hood (attached to the nape part) for heat isolation. However, a dive hood supplies better protection by surrounding both the neck and the nape.
Remember that the majority of the water leak happen from the neck part of our dive suits. By placing the bibs of the dive hood into the dive suit, heat isolation can be doubled. That’s why some of the dive hood’s bibs are longer. Dry suit divers prefer to use special dry suit hoods.
There are a variety of thicknesses to choose. But the most important clue when buying a dive hood is the size of it. If a dive hood is very tight, it may pressurize the neck, causing Carotid Sinus Reflex. So, the dive hood you choose must be comfortable enough.
Select a dive hood that already has a vent at the top of it. If there is none, you can do it manually. Some of the bubbles that you exhale may get trapped between your head and the dive hood. A small vent will allow the bubbles to go out of your dive hood. Or, those bubbles will try to take the hood out of your head and make you discomfort.