The Crosstown Slim All-in-One Convertible Car Seat grows with your child from birth to 10 years, offering 3 modes of use: rear-facing car seat (5–40 lbs., 19"–40"), forward-facing car seat (30–65 lbs., 34.4"–49"), and belt- positioning booster seat (40–100 lbs., 43.4"–52"). Its slim 17" design saves space and allows you to fit 3 seats across the back row of most vehicles. The one-hand adjustable harness and 8-position headrest provide a secure, comfortable fit as your child grows—without the hassle of rethreading the harness.