Nip press belt (9) of a wet press (1) or a calender with elongated nip, in particular for a paper, cardboard or tissue machine, with a flexible carrier layer (9a) that is impermeable to liquids and is made of soft rubber having a hardness in the range between 20 and 50 P+J and an integrated textile reinforcement (9b), and with a covering layer (9c) that is fixedly connected to the carrier layer or formed together therewith.