An article for use in providing temperature regulation properties, comprising: a substrate, wherein the substrate carries at least one reactive function; a first functional polymeric phase change material, wherein the first functional polymeric phase change material (FP-PCM) has at least one phase change temperature in the range between -10° C and 100° C and a phase change enthalpy of at least 2.0 Joules per gram, wherein the first functional polymeric phase change material comprises at least one hydrophilic or hydrophobic crystallizable section, the polymer of the first functional polymeric phase change material comprising a backbone and side chains the side chains forming a crystallizable section, wherein the molecular weight of first functional polymeric phase change material is of at least 500 Daltons with the weight of the crystallizable section forming at least 20%, of the total weight of the FP-PCM, wherein the first functional polymeric phase change material carries a plurality of reactive functions, wherein the plurality of reactive functions are capable of forming at least two covalent bonds, at least two electrovalent bonds or at least one covalent bond and one electrovalent bond; a second phase change material; and at least one containment structure containing the second phase change material, wherein the containment structure is a microcapsule, and wherein the microcapsule comprises a core with the second phase change material and a shell, wherein the shell carries at least one reactive function capable of forming at least one of covalent or electrovalent bond, wherein the first functional polymeric phase change material is bound to the substrate and to the containment structure, wherein binding is resulting from a reaction between a reactive function of the FP-PCM and a reactive function of the substrate and a reactive function of the microcapsule; respectively, and wherein the containment structure is bound to the substrate and to the first functional polymeric phase change material. a substrate, wherein the substrate carries at least one reactive function; a first functional polymeric phase change material, wherein the first functional polymeric phase change material (FP-PCM) has at least one phase change temperature in the range between -10° C and 100° C and a phase change enthalpy of at least 2.0 Joules per gram, wherein the first functional polymeric phase change material comprises at least one hydrophilic or hydrophobic crystallizable section, the polymer of the first functional polymeric phase change material comprising a backbone and side chains the side chains forming a crystallizable section, wherein the molecular weight of first functional polymeric phase change material is of at least 500 Daltons with the weight of the crystallizable section forming at least 20%, of the total weight of the FP-PCM, wherein the first functional polymeric phase change material carries a plurality of reactive functions, wherein the plurality of reactive functions are capable of forming at least two covalent bonds, at least two electrovalent bonds or at least one covalent bond and one electrovalent bond; a second phase change material; and at least one containment structure containing the second phase change material, wherein the containment structure is a microcapsule, and wherein the microcapsule comprises a core with the second phase change material and a shell, wherein the shell carries at least one reactive function capable of forming at least one of covalent or electrovalent bond,