Cellulase fusion proteins comprising an endoglucanase core region and a heterologous cellulose binding domain are described. The fusion proteins may be produced by recombinant techniques using appropriate polynucleotides, expressing vectors and host cells. The fusion proteins and enzyme preparations thereof are useful in treating cellulosic material, such as textile material, and they are particularly useful in biostoning denim or in biofinishing fabrics and garments. In addition the fusion proteins may be used in pulp and paper industry, oil extraction from plants, detergent compositions, or for improving the quality of animal feed.