The Graco 3 in 1 and 2 in 1 car seats are both designed to provide maximum comfort and safety for your little one while traveling. The main difference between the two is that the 3 in 1 model can be converted from a rear-facing infant seat, to a forward-facing toddler seat, then into an booster seat as your child grows. The 2 in 1 model features just two stages: it starts out as a rear-facing infant seat and converts into a forward-facing toddler seat. Both models feature adjustable headrests, integrated harness systems, energy absorbing foam padding for impact protection, side impact testing certification and latch connectors that make installation quick and easy. Additionally, they both have removable machine washable covers with extra cushioning for added comfort during longer car rides.