A method for preparing an elastomeric fiber comprising the step of synthesizing a bio-derived 1,4-butanediol from succinate or α-ketoglutarate via 4-hydroxybutyrate in a recombinant microorganism that includes a 2-oxoglutarate decarboxylase or a succinyl-CoA synthetase, a CoA-dependent succinate semialdehyde dehydrogenase, a 4-hydroxybutyrate dehydrogenase, a 4-hydroxybutyrate-CoA transferase, a 4-hydroxybutyrate-CoA reductase, and an alcohol dehydrogenase; wherein in such a recombinant microorganism: (i) said succinate is converted to succinyl-CoA using said succinyl-CoA synthetase, followed by conversion of succinyl-CoA to succinyl semialdehyde using said CoA-dependent succinate semialdehyde dehydrogenase; or said 2-oxoglutarate decarboxylase is used to convert said α-ketoglutarate to succinyl semialdehyde; (ii) said succinyl semialdehyde is converted to said 4-hydroxybutyrate using said 4-hydroxybutyrate dehydrogenase, followed by conversion of 4-hydroxybutyrate to 4-hydroxybutyryl-CoA using said 4-hydroxybutyrate-CoA transferase then to 4-hydroxybutyraldehyde using said 4-hydroxybutyrate-CoA reductase; and (iii) said 4-hydroxybutyraldehyde is converted to said 1,4-butanediol using said alcohol dehydrogenase; wherein said method further comprises the steps of: (a) providing a polymeric glycol composition which includes at least one polymeric glycol derived from said bio-derived butanediol; (b) contacting said polymeric glycol composition with at least one diisocyanate; (c) dissolving the capped glycol in a solvent to provide a capped glycol solution; (d) contacting the capped glycol solution with a chain extender composition; and (e) spinning the solution to form the elastomeric fiber. a 2-oxoglutarate decarboxylase or a succinyl-CoA synthetase, a CoA-dependent succinate semialdehyde dehydrogenase, a 4-hydroxybutyrate dehydrogenase, a 4-hydroxybutyrate-CoA transferase, a 4-hydroxybutyrate-CoA reductase, and an alcohol dehydrogenase; wherein in such a recombinant microorganism: (i) said succinate is converted to succinyl-CoA using said succinyl-CoA synthetase, followed by conversion of succinyl-CoA to succinyl semialdehyde using said CoA-dependent succinate semialdehyde dehydrogenase; or said 2-oxoglutarate decarboxylase is used to convert said α-ketoglutarate to succinyl semialdehyde; (ii) said succinyl semialdehyde is converted to said 4-hydroxybutyrate using said 4-hydroxybutyrate dehydrogenase, followed by conversion of 4-hydroxybutyrate to 4-hydroxybutyryl-CoA using said 4-hydroxybutyrate-CoA transferase then to 4-hydroxybutyraldehyde using said 4-hydroxybutyrate-CoA reductase; and (iii) said 4-hydroxybutyraldehyde is converted to said 1,4-butanediol using said alcohol dehydrogenase; (i) said succinate is converted to succinyl-CoA using said succinyl-CoA synthetase, followed by conversion of succinyl-CoA to succinyl semialdehyde using said CoA-dependent succinate semialdehyde dehydrogenase; or said 2-oxoglutarate decarboxylase is used to convert said α-ketoglutarate to succinyl semialdehyde; (ii) said succinyl semialdehyde is converted to said 4-hydroxybutyrate using said 4-hydroxybutyrate dehydrogenase, followed by conversion of 4-hydroxybutyrate to 4-hydroxybutyryl-CoA using said 4-hydroxybutyrate-CoA transferase then to 4-hydroxybutyraldehyde using said 4-hydroxybutyrate-CoA reductase; and (iii) said 4-hydroxybutyraldehyde is converted to said 1,4-butanediol using said alcohol dehydrogenase; wherein said method further comprises the steps of: (a) providing a polymeric glycol composition which includes at least one polymeric glycol derived from said bio-derived butanediol; (b) contacting said polymeric glycol composition with at least one diisocyanate; (c) dissolving the capped glycol in a solvent to provide a capped glycol solution; (d) contacting the capped glycol solution with a chain extender composition; and (e) spinning the solution to form the elastomeric fiber. (a) providing a polymeric glycol composition which includes at least one polymeric glycol derived from said bio-derived butanediol; (b) contacting said polymeric glycol composition with at least one diisocyanate; (c) dissolving the capped glycol in a solvent to provide a capped glycol solution; (d) contacting the capped glycol solution with a chain extender composition; and (e) spinning the solution to form the elastomeric fiber.