Kwark Thermal Hat
We lose ca. 30% of the heat through our heads. Just after taking off a neoprene hood a wet head gets cold very fast and cools whole body. What is worse, you can catch a cold easily and a running nose can ruin your diving plans.
In summer (and for people who are warm even in winter) we recommend a hat "Profil" made of Powerstretch Pro and Wind Pro. It is light, elastic and soft. It fits well to the shape of the head. Ears are protected from wind. It is useful for running and works well under a helmet as well, e.g. for skiing or cycling.