Surprise: Put a surprise in the pocket on Christmas day and surprise your little one! Festive bedding set: Get a kids' advent calendar duvet set! Pillowcase: Get one pillowcase with the single, two with double. Advent: With advent countdown design and a working pocket for December 25th. Material: Super-soft, made using 48% cotton and 52% polyester for a comfy feel. Size: Choose from two sizes; single or double. Advent Calendar Duvet Set | Living Social