JJ Cole, Car Seat Covers,a Polar Bundle Me, Slate 0 4 years, extendable bottom that grows with your child. Wipeable foot area opens completely to accommodate shoes. The versatile Polar Bundle me features an extendable bottom that grows with your child, for use from 0 4 years of age. As your child grows, simply unzip and unfold the hidden lower panel for extra leg room. The bottom also opens completely to allow for further growth. A soft interior and cozy hood maximize heat