group consisting of 2 2 u2032 oxybis n n dimethylethanamine and or 2 2 dimethylamino ethoxy ethyl methyl amino ethanol the catalyst systems of the present invention are useful in the manufacture of flexible polyurethane polyester foams and are especially useful in areas that require less odor and or emissions the catalyst combination is also useful as a co catalyst in combination with other catalyst systems to improve flow skin cure and de mold times in flexible molded polyether foams or to replace n ethyl morpholine or catalyst combinations that contain n n dimethylpiperazine such as jeffcat u00ae dm 70 one very surprising and unexpected result of the combination of the catalyst components to provide a catalyst combination according to the invention is that low odor foams that show no pinking can bee obtained with the combination of a blowing catalyst such as methoxyethylmorpholine and n n bis 3 dimethylamino propyl formamide this is unexpected because foams produced with a weak blowing catalyst such as methoxyethylmorpholine or dimorpholinoethylether alone produce foam which turns pink u201c pinking u201d further foams produced with a weak blowing catalyst such as dimorpholinoethylether in combination with a strong blowing catalyst such as dimethylpiperazine produce pink foams.