Polyester ALL-IN-ONE-BOX SOLUTION: This infant car seat and stroller combo includes the Willow SC rear-facing car seat (4-30 lbs), the Alpine base, and the Grove modular stroller (up to 50 lbs), plus a CozyFit stroller insert and a bumper bar 6 WAYS TO RIDE: This car seat and stroller combo features parent-facing and forward-facing options for infant car seat mode, stroller seat mode with the CozyFit insert, and toddler mode; the CozyFit insert allows infants to ride in the stroller starting at 10 lbs when the seat is fully reclined; pair the Grove stroller with the Britax Zinnia bassinet for additional ways to ride (sold separately) FAST, SECURE, & PARENT-FRIENDLY INSTALLATION: The Willow SC infant car seat features ClickTight technology, so you know it can be installed securely in your vehicle on the first ride and beyond ULTRA-PORTABLE, ONE-HAND FOLD: The infant car seat is lightweight and easy to carry with an aluminum carry handle that easily adjusts with one hand; the Grove toddler and baby stroller features a lightweight, durable frame with a one-hand compact fold, plus all-wheel suspension and no-flat tires TRUSTED BRITAX SAFETY: The ReboundReduce stability bar on the Alpine base helps minimize movement in a crash, and the car seat carry handle also helps provide stability when used in the upright position; the car seat is side-impact tested according to FMVSS 213a; it is also tested to FMVSS 213 frontal impact standards; the car seat is also verified by the Baby Safety Alliance CUSTOMIZE TO BABY’S SIZE: The RightSize system on the Willow SC baby car seat provides adjustment points at the hips, shoulders, and between the legs to help you find the perfect fit for your child from the start NATRUALLY FLAME-RETARDANT SAFEWASH FABRICS: The infant car seat cover and stroller insert are safe to machine wash and dry for quick and easy cleanup, and they’re naturally flame-retardant with no added FR chemicals STAY CLEANER, LONGER: StayClean fabrics on the car seat cover and CozyFit insert resist stains, moisture, and odors CRUISE IN ANY WEATHER: The infant car seat and baby / toddler stroller both include a UPF 50+ canopy with a flip-down visor, plus a peek-a-boo window with a quiet magnetic closure; the stroller canopy is also water-resistant to help keep your little one dry EXTRA ROOM FOR ESSENTIALS: This stroller has an extra-large cargo area and five additional pockets to keep your valuables, drinks, and other must-haves handy