Bone mules Smooth faux leather upper, lining and sole. Slip-on style. Approx 8cm heel. Size 8 is an EU39. This shoe runs true to size. Block heel. Your work to date easy mule is here! The BILLINI Novato Mules are super easy to slide on or off and will have you look chic all day and night. These mules offer modern square-toes and knotted toe strap detail. Style these with jeans and an oversized blazer.