This invention relates to a polymer composition comprising: (A) at least one polyester, and (B) a stabilizer composition comprising: (1) at least one primary antioxidant comprising at least one hindered phenolic antioxidant; (2) at least one secondary antioxidant comprising at least one phosphite; (3) at least one chain extending agent; (4) at least one ultraviolet light absorbing agent; and (5) at least one hindered amine light stabilizer.