The present invention relates to a composition comprising at least one thermoplastic polyurethane TPU-1 based on an aliphatic diisocyanate, a thermoplastic polyurethane TPU-2 based on an aromatic diisocyanate, a melamine cyanurate, a first phosphorus-containing flame retardant (F1) selected from the group consisting of derivatives of phosphoric acid and derivatives of phosphonic acid and a further phosphorus-containing flame retardant (F2) selected from the group consisting of derivatives of phosphinic acid. The present invention further relates to the use of such compositions for production of cable sheaths.