From baby to big kid, the KNOX Convertible Car Seat is packed with intuitive safety features and easily adapts as children grow and their positioning needs change.
Safety you can see
Our unique technology, utilizing a tightness indicator and robust tensioning clips, provides visual confirmation of a correct install, not to mention peace of mind.
The ultimate damage control system
Koroyd® was developed from aerospace safety research, innovated for action sports, now built-in to the base of the KNOX car seat providing more advanced impact protection.
Koroyd’s welded tubes crumple instantly and consistently on impact, absorbing maximum force in a controlled manner, minimizing energy transferred to the child.
Tether them better
The Multi-Directional Tether reduces seat rotation and stress on the child’s head and neck in the event of impact. When used in rear-facing mode, the Multi-Directional Tether reduces potential injury by 45%.*
*2020 results from crash testing conducted at independent labs in U.S. and Canada.
Adjust with ease
Our no-rethread harness, eight-position headrest, and four-position recline all adjust quickly and easily as your child grows.
Sip and go
Sippy cup or water bottle, the KNOX includes a removable cup holder that can attach to either side of the seat. When spills happen, the seat base fabric can be removed for easy cleaning.
Energy Response Technology
A family of features designed to protect and provide unparalleled side impact protection.
Protection that’s heads above the rest
Absorption and recovery properties of specialized foams in the Active Support Headrest provide advanced side impact protection that grows with your child.
A small feature that makes a big difference
Positioned on the side of shell and always engaged, the Side Impact Pods absorb and deflect crash forces during a side impact crash.
Impact dispersion zone
Strategic placement of EPP foam between the inner and outer shell ensures forces are absorbed into the seat rather than the child.
UPPAbaby offers a LIMITED LIFETIME WARRANTY on all car seats representing our commitment to child passenger safety.
Suitable for approximately 1–6 years old Rear-facing: from 14–45 lbs, and using the included fit inlay from 14–25 lbs Forward-facing: from 25–65 lbs Height: up to 49″
Dimensions: 23.8” L x 18.8” W x 27.4–32.5” H (height reflects headrest in lowest and highest positions)
SMARTSecure® System with red-to-green tightness indicator provides visual confirmation the car seat is installed correctly
Koroyd® technology integrated into the base creates an effective crumple zone protecting the child from impact forces
Multi-Directional Tether for rear and forward-facing travel reduces seat rotation and stress on the child’s head and neck upon impact
Two-piece fit inlay allows for flexibility and proper fit
No-rethread harness adjusts with eight-position headrest
Side Impact Pods for additional impact absorption
Active Support Headrest that grows with your child
EPP foam between the inner and outer shell ensures forces are absorbed into the seat
Color coded belt paths with robust tensioning clips
Multi-position, adjustable foot for leveling
Storage pockets for harness buckles
Bead level indicators on both sides of the seat
Removable cup holder included
Removable and washable seat fabric
One naturally fire resistant option through innovative use of Merino wool
US shipping only
PLEASE ALLOW UP TO 10 BUSINESS DAYS FOR PROCESSING. While we have many items in stock, some items do need to be special ordered. Please contact us if you have questions about a specific product