Jingle Jam PJ's are perfect for snuggling up in on a cold winter’s night. The four-legged construction features red trim, santas, trees and penguins on a white background and a faux back flap with button detail. These cozy pajamas are made of an interlock cotton blend that’s machine washable. Wash in cold with like colors. Line Dry. For a proper fit, measure your dog from the base the neck to the base of the tail and refer to sizing chart.