Madewell Women Leather Sandal The Boardwalk Post Slide Flats Flip Flop Slip On Size 8 1/2. MC908, SU21, Fits true to size, leather upper, Man-made sole. Excellent pre-owned condition. Approximate measurements - size 8.5 is 10 1/4 inches length. Tags: Madewell, sandals, slip-on, date night, casual, summer, spring, vacation, beach. Fast same and next day shipping.