Polyester INFANT CAR SEAT AND STROLLER COMBO: The Britax Willow Brook Baby Travel System includes the Willow car seat, Aspen base, and Brook baby stroller INSTALL CONFIDENTLY: The Willow is the only rear facing car seat for 4 to 30 lbs with ClickTight technology so you know it can be installed securely on the first ride and beyond FIND THE PERFECT FIT: The RightSize system provides adjustment points at the hips, shoulders and between the legs to help you find your baby's perfect fit from the start FOUR WAYS TO STROLL: The Brook stroller is suitable for children up to 50 lbs and offers reversible infant and toddler seats that easily switch from parent-facing to forward-facing SIDE IMPACT TESTED: Helps protect your child's head, neck and torso and SafeCell Technology is designed to help manage energy and minimize force transferred to baby REBOUNDREDUCE CARRY HANDLE: Acts as a stability bar when used in the upright position and can be used when installed with or without the base MOVE SMOOTH, STROLL STEADY: This toddler stroller is lightweight, easy to carry and features all-wheel suspension and tough, no-flat tires BASE-FREE STABILITY: Extra belt path on the back of the seat for added security when installing without the base CRUISE IN ANY WEATHER: The water-resistant UPF 50 plus canopy has a flip-down sunshade for comfortable cruising on sunny or rainy days and the infant insert pillow is designed to provide a more customized fit for newborns under 11 lbs MACHINE WASHABLE CAR SEAT COVER: The car seat features naturally flame-retardant fabrics with no added FR chemicals and comes with a washer and dryer-friendly cover for quick and easy cleanup