end the frictional lining 4 which may be made of organic material for example of paper fibers and appropriate strengthening components such as resin or glue is of porous structure so that a flow volume of the cooling oil can flow in the direction of arrow 9 from the pressurized chamber 7 into a chamber 8 with lower pressure at a defined pressure differential and with the defined geometric dimensions the flow volume can be optimized by specifying the porosity to increase the flow volume for improved cooling without increasing the pressure the invention proposes that at least one cut out be provided in the friction lining which promises improved distribution of the cooling oil in the cross section of the friction lining in this case cut out 10 is not compressed more severely in a pressing process than the rest of the friction lining which would result in occupancy of supporting part 6 over the entire friction lining surface instead the cut out is removed from friction lining 4 in this way an additional open area 11 appears on supporting part 6 which can be cooled in addition to the corresponding open area 12 by the cooling oil this is beneficial in particular when wet clutch 1 is operated with little slippage for example at low revolutions per minute so that with the slow relative rotation of wet clutch 1 while otherwise wet clutch 1 is engaged the free areas slowly shift and as a result are exposed to the cooling by the cooling oil fig2 shows a partial view of an advantageous embodiment of a friction lining 4 according to the invention as it can be employed.