Boppy 2-Sided Cotton Slipcovers Adding eye-catching style to a nursery necessity, the Boppy 2-Sided Cotton Slipcovers will extend the life of your Boppy Pillow. For two looks in one slipcover, Boppy offers eight coordinating front and back designs. The poly-cotton blend slipcovers are machine washable and feel great on baby's skin. Be sure to get a spare for any messes. Dress up your Boppy! Order the 2-Sided Cotton Slipcovers today!