An extensible flexible hose for transporting liquids, particularly water, comprising: - at least one inner layer made of a first elastic polymeric material; - at least one outer layer made of a second elastic polymeric material; - at least one first and at least one second textile reinforcement layers ( 30, 40) interposed between said at least one inner layer and at least one outer layer; wherein said at least one inner layer and at least one outer layer are reciprocally coupled to form a unitary tubular member, said at least one first and at least one second textile reinforcement layers ( 30, 40) being embedded therein; wherein said unitary tubular member has an elasticity such to automatically elongate and enlarge upon the working pressure given by the liquid flowing therethrough to respectively increase its original length and diameter and such to automatically recovery once the working pressure stops for assuming again said original length and diameter; wherein said at least one first and at least one second textile reinforcement layers ( 30, 40) are susceptible to move between a rest configuration that have when no liquid flows through the unitary tubular member and a working configuration that have when said unitary tubular member elongates and enlarges upon the working pressure; wherein said unitary tubular member has the original diameter and the original length when said at least one first and at least one second textile reinforcement layers ( 30, 40) are in the rest configuration, said unitary tubular member being enlarged and elongated when said at least one first and at least one second textile reinforcement layers ( 30, 40) are in the working configuration; wherein said at least one first textile reinforcement layer and said unitary tubular member are reciprocally configured so that the former captures the latter upon its elongation so as to define the maximum length, said at least one second textile reinforcement layer and said unitary tubular member being reciprocally configured so that the former captures the latter upon its enlargement so as to define the maximum diameter; wherein said second textile reinforcement layer is externally placed with respect to said first textile reinforcement layer, said at least one first textile reinforcement layer being selected among the group consisting of knitting, weaving or knotting, said at least one second textile reinforcement layer being a spiral or a braiding, wherein braiding consists of at least two yarns or groups of yarns wound as a spiral with opposite inclinations and overlapping but not connected to each other; wherein said unitary tubular member and said at least one first and at least one second textile reinforcement layer ( 30, 40) cooperate each other so that under a working pressure of 2 bar the hose increases its length of at least 1,5 times with respect to its original length. - at least one inner layer made of a first elastic polymeric material; - at least one outer layer made of a second elastic polymeric material; - at least one first and at least one second textile reinforcement layers ( 30, 40) interposed between said at least one inner layer and at least one outer layer;