In the past few years we have been interested in understanding fracture of soft materials such as gels, elastomers and adhesives. We have focused specifically on the intermediate length scale of the order of hundreds of microns, which is highly stretched in front of the crack tip, and on the mechanisms bridging the gap between the macroscopic fracture toughness and the molecular scale. We have in particular explored in hydrogels the effect of a combination of reversible and permanent bonds on the fracture toughness of the material and on elastomers the effect of interpenetrated networks of polymer chains stretched at various levels. Recent results combining macroscopic, microscopic and molecular observation tools will be presented.