The original 3-across all-in-one convertible car seat with SafePlus™ engineering. Up to 10 years of use with 12 SafePlus™ upgrades. Features: -10 Years One Car Seat - from Birth to Booster (1.8 - 54 kg) it's all you will need. Grows with your child, ultimate protection on every road trip. 4 modes in 1 seat! -Rear Facing for Longer - lovingly engineered to keep your child rear-facing up to 54 kg, with SafePlus™ Engineering. -Fits 3-Across - our famous slim-fit design with SafePlus™ 6-layer side impact protection with zero compromises to safety, space, or comfort. -Mechanically engineered from reinforced automotive grade high-strength steel, our unique core shell shields and protects your child. -One hand easy-adjust 12-position headrest, the SafePlus™ completes 6 layers of enhanced, rigorously tested, side impact protection. -The original and only all-in-one convertible car seat that folds for travel or compact storage. FAA approved for airline use. Dimensions: Minimum User Weight: 1.8 kg Maximum User Weight: 54 kg Minimum User Weight - Rear Facing: 1.8 kg Maximum User Weight - Rear Facing: 22.7 kg Maximum User Weight - Rear Facing LATCH: 15.8 kg Minimum User Weight - Forward Facing: 10 kg Maximum User Weight - Forward Facing: 29.5 kg Maximum User Weight - Forward Facing LATCH: 18 kg Minimum User Weight - Booster: 18 kg Maximum User Weight - Booster: 54 kg Maximum User Height: 145 cm Product Height: 72.4 cm Product Width: 43.2 cm Product Depth: 40.6 cm Product Height - Folded: 72.4 cm Product Width - Folded: 43.2 cm Product Depth - Folded: 29.2 cm Seat Weight: 13.3 kg Number of Head Support Positions: 12