Wearing a beanie during cold water immersion, especially in windy conditions, can prevent dizziness by keeping the head warmer and maintaining blood flow to the brain.

“the beanie is also because I have a little bit of sensitive ears so it meaning that if there's wind and because we swim in the open sea in Denmark we have a lot of wind our wind our conditions are just very rainy very windy and when the temperature is also freezing you could get this um what is that called um so very cold and Li headed just from wind so if you also sub merg into cold water and you then get up you could you will get a brain freeze immediately yeah so it is enough to just go up to the neck wear a beanie to just not get dizy also because the the um the heat loss is increased of course but also the blood flow to the brain has decreased so the beanie will keep you a little bit warmer so you can stay for one to two minutes”