Shop MAC Studio Fix Powder Plus Foundation online at Macys.com. MAC Studio's Fix is a buildable, color-true powder foundation. Its oil-free formula delivers medium-to-full coverage with a natural finish that won't cake, streak, or settle into pores. Plus, its oil- and shine-controlling ingredients help to instantly reduce the appearance of pores. The powder works well with a fluffy brush for lighter coverage or with the sponge applicator for more coverage.