15.5 oz mug made from new bone china and includes one pair of matching socks made from a cotton, polyester, and Spandex blend that fits shoe size- Women's US 9-13 // EURO 39-43 Men's US 8-12 // EURO 41-45. "Happy Birthday To You" text and accompanying design is printed onto the front of the mug, while the socks feature a sewn-in streamers pattern. CARE INSTRUCTIONS: Machine wash socks on a gentle cycle with cold water. To best preserve decals, washing the mug by hand is recommended. Dishwasher safe. Microwave safe.