A propylene-ethylene-diene terpolymer and method of making such comprising from 2% to 25% wt % by weight of ethylene, from 98% to 75% wt % by weight propylene and from 1% to 21% wt % by weight of a diene, wherein the terpolymer has a crystallinity of less than 3%, a melt flow rate (MFR) of less than 10 and a Tg by DSC of from −2° C. to −25° C. and methods to prepare the terpolymer are depicted.