A modified high cis polydiene polymer comprising a. at least one polymer chain resulting from polymerization of a quantity of conjugated diene monomer and bearing a residue from a functionalizing compound selected from i. wherein n is an integer of 1 to 16, preferably 1 to 10, more preferably 1 to 3, or ii. wherein R 1 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), and R 2 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), b. a residue from a coupling agent having at least one polymer chain of (a) bonded thereto, wherein the coupling agent is selected from silicon halides, preferably having formula III or IV as follows Si(R*) n (Y) 4-n III wherein each R is independently selected from monovalent organic groups having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1-6 carbon atoms, and each Y is a halogen atom or an alkoxy of C 1 -C 10 , preferably C 1 -C 6 , more preferably C 1 -C 2 , and n is an integer of 0-3, preferably 0-2, R**[SiY 3 ] 2 IV wherein R** is a hydrocarbylene group having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1-6 carbon atoms, and each Y is a halogen atom or an alkoxy of C 1 -C 10 , preferably C 1 -C 6 , more preferably C 1 -C 2 , and the residue from the coupling agent has at least one halide replaced by a polymer chain of (a), wherein the modified high cis polydiene has a cis 1,4-bond content of at least 92%, preferably at least 94%, and a Mooney viscosity ML 1+4 at 100 °C of 40-80, preferably 45-80. a. at least one polymer chain resulting from polymerization of a quantity of conjugated diene monomer and bearing a residue from a functionalizing compound selected from i. wherein n is an integer of 1 to 16, preferably 1 to 10, more preferably 1 to 3, or ii. wherein R 1 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), and R 2 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), i. wherein n is an integer of 1 to 16, preferably 1 to 10, more preferably 1 to 3, or ii. wherein R 1 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), and R 2 is selected from H and hydrocarbyl of C1-C20 (preferably C1-C10, more preferably C1-C4), b. a residue from a coupling agent having at least one polymer chain of (a) bonded thereto, wherein the coupling agent is selected from silicon halides, preferably having formula III or IV as follows Si(R*) n (Y) 4-n III wherein each R is independently selected from monovalent organic groups having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1-6 carbon atoms, and each Y is a halogen atom or an alkoxy of C 1 -C 10 , preferably C 1 -C 6 , more preferably C 1 -C 2 , and n is an integer of 0-3, preferably 0-2, R**[SiY 3 ] 2 IV wherein R** is a hydrocarbylene group having 1 to 20 carbon atoms, preferably 1 to 10 carbon atoms, more preferably 1-6 carbon atoms, and each Y is a halogen atom or an alkoxy of C 1 -C 10 , preferably C 1 -C 6 , more preferably C 1 -C 2 , and the residue from the coupling agent has at least one halide replaced by a polymer chain of (a), <EOS>