The 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 thermaplushTM interior and cozy hood maximize heat retention. The JJ Cole Polar Bundle Me - Slate Features: JJ Cole Polar Bundle Me is for use with car seats, strollers and joggers, sold separately The extendable bottom grows with your child from infant to toddler. Removable top for temperature control. Allows safety straps to rest directly on the child. Machine washable. JJ Cole makes fashion-forward, quality products for today's on-the-go parents. JJ Cole's travel gear, diaper bags, baby bunting and more are designed with style, function, and safety in mind. Find even more baby travel essentials and registry must-have's in our JJ Cole Collections Store !