A pair of notches or slits in a collar can prevent the formation of bulky crests or wrinkling when the collar is arranged in an outer open \u2018continental style\u2019 under a jacket, however there is also a propensity for such a collar to curl up at the notches. Edges of the isolation layer and the skin contact layer are integrated to form a main body while the disinfecting antitoxic layer as well as the blood absorbing and styptic layer are separated from each other and both enclosed inside the main body. Further, the ring-shaped or plate-like element in the relief region has at least one thickness which is reduced by the height of the relief region and which is selected so that the feedthrough opening can be punched out of the ring-shaped or plate like element having the reducing thickness.