Patent ID: 6983554

Claim:
An article of footwear, comprising an upper and a sole attached to said upper, said sole comprising a fluid-filled bladder comprising a laminate membrane, wherein said laminate membrane comprises at least a first layer comprising a thermoplastic polyurethane and a copolymer of ethylene and vinyl alcohol, wherein said thermoplastic polyurethane includes at least about 50 mole percent, based on the total moles of hydroxyl-functional reactants used to produce the polyurethane, of a polyester diol having a weight average molecular weight of at least about 500 and having a linear alkylene group having from two to about six carbon atoms between substantially all of the ester groups, wherein the first layer has a haze of not more than about 12%, and a second layer comprising a copolymer of ethylene and vinyl alcohol; wherein at least a part of said membrane forms at least a part of an exterior portion of said sole.