When it’s cold we really don’t feel comfortable thankfully there are clothes, jackets and coats to make us warm during these cold days.But have you wondered what is happening to our body when it’s really cold. Not only is it terribly uncomfortable to go into the cold without a thick coat, it’s actually very dangerous as human can succumb to hypothermia very quickly. To demonstrate just how quickly we human lose heat in the winter without a jacket, Oli Martin of BBC Earth Unplugged undressed outside in the bitter winter cold while being recorded with a military spec Selex Merlin thermal imaging camera. You can also feel free to watch and see what happen below. Have some and learn something!