Thermoplastic polyurethane containing structural units of polyester and polyether diols

An improved thermoplastic polyurethane (TPU) molded shoe sole comprising:

• a. from about 30 to about 55 weight percent based on total TPU of hard segment comprising structural units of (i) diisocyanate and (ii) chain extender;
• b. from 45 to about 70 weight percent based on total TPU of soft segment comprising structural units of:
• (i) polycaprolactone diol having a molecular weight of from about 300 to about 8,000 in an amount of from about 20 to about 80 weight percent based on total weight of the TPU soft segment and
• (ii) poly(oxypropylene)-poly(oxyethylene) glycol polyether diol having a molecular weight of from about 1,500 to about 3,000 in an amount of from about 20 to about 80 weight percent based on total weight of the TPU soft segment, where the oxyethylene group content is less than 25 weight percent of the polyether diol total weight;
• wherein the “index” is from about 0.95 to about 1.10, and
• wherein the molded shoe sole has a Shore A hardness in the range of from about 60 to about 98.