The invention provides a polyurethane that is a reaction product of reaction components, the reaction components comprising (a) a polyol; (b) a polyisocyanate selected from an aromatic, alicyclic or aliphatic polyisocyanate or combinations thereof; (c) a mixture of chain extenders that includes (i) a chain extender having a sulfur bridge in an amount of between 1 and 30 weight percent of the total mixture of claim extenders and (ii) a main chain extender, wherein the chain extender having a sulfur bridge. The chain extender having a sulfur bridge may be characterized as R1 - A - Sx - B - R2 wherein R1 and R2 are selected from an OH, an NH2 or combinations thereof, A and B are selected from a divalent aliphatic, alicyclic or aromatic organic group or combinations thereof, A and B may be the same or different and x is an integer of between 2 and 10.