A heat activated fabric treatment composition comprising: a) at least 1% by weight of one or more quaternary ammonium fabric softening materials, b) at least 1% by weight of a non-ionic surfactant, such that components a) and b) comprise at least 30% by weight of the composition, c) at least 20% by weight of a fatty component selected from fatty acids having a melting point of at least 40° C., fatty alcohols having a melting point of at least 40° C. and mixtures thereof, d) from 5 to 30% by weight water. The composition is provided in a dispensing device which, in use, is attached to the internal panel of a tumble dryer.