Size 38/W7 - MESSAGE COZY GRANDPA MULE Black The Size 38/W7 - MESSAGE COZY GRANDPA Mule in Black is a comfortable slipper designed for men by the brand Message. This mule style slipper is in a classic black color and is perfect for lounging at home. With a US shoe size of 7 and EU shoe size of 38, this slipper is sure to provide a cozy and snug fit for all-day wear.