Saucony Grid Fastwitch is a very lightweight running shoe that is very responsive made by the large running shoe company, Saucony. Even though it is a light shoe, there is some good medial support making it a good shoe for the over-pronators. It is light enough to be a racing flat, so could be used by overpronators when competing in races. The uppers are very breathable, so it is a very comfortable shoe. Also, surprisingly for a lightweight shoe, it has good cushioning and stability with a mini medial post and a good shank in the midfoot. This could be the perfect marathon racing shoe.