Abstract: Solid and microcellular polyurethane elastomers prepared by reacting (a) liquid polyesters containing from about 25 percent by weight to about 70 percent by weight of the epsilon-oxycaproyl unit, the balance of the polyester being derived from the reaction of at least one dicarboxylic acid with at least two glycols selected from the group consisting of ethylene glycol 1,3-propanediol, 1,4-butanediol and 1,5-pentanediol, (b) an organic polyisocyanate, and optionally (c) a chain-extender comprising water, glycols, amino alcohols, or diamines. If the liquid polyester (a) is branched, for example, by addition of small quantities of a triol, the reaction with the organic polyisocyanate may be conducted in the absence of a chain-extender. Processes for producing these elastomers are also disclosed.