Stay safe. Keep going.™
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.
Knox®
$239.99 - $349.99
Knox®
$239.99 - $349.99
Free shipping on all orders over $50!
Knox
- SMARTSECURE® System for easy installation
- Energy Response Technology for unparalleled side impact protection
- No-rethread harness, eight-position headrest, and four-position recline
- Active Support Headrest with specialized foams for added absorption
Must Have Additions
CLEANTECH™ Collection
Not Sure Which Style?
Pick up to 4 favorites and we’ll send them to you absolutely free here
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Keep baby safe from day one with our original fire retardant free fabric. These fabrics are not treated and contain no harmful chemicals anywhere on the seat. Includes fashions for the Mesa V2, Knox, and Alta.
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Our merino wool fabric is hypoallergenic, temperature regulated, and made of materials that are naturally fire retardant free to keep baby safe in the purest form. The merino wool is woven naturally to eliminate the need for any additional treatment. Includes fashions for Mesa V2, Mesa Max, and Knox.
Details & Specifications
- 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
Convertible Car Seat
Removable, Dishwasher Safe Cup Holder
Support & FAQs
Selected FAQs (view the complete Knox® FAQs)
While not required by law, the Multi-Directional Tether is strongly recommended for use in both rear and forward-facing mode for optimal protection. It significantly reduces injury scores by as much as 45%.
(*2020 results from crash testing conducted at independent labs in U.S. and Canada)
In both rear-facing and forward-facing mode, the headrest should be positioned at the child’s shoulders to ensure proper fit of the harness. The headrest can lightly touch the shoulders and allow 1 in of space between the child’s shoulders and headrest.
The fit inlay must be used with children from 14 - 25 lbs in order to achieve a proper harness fit.
Koroyd’s welded tubes crumple instantly and consistently on impact, absorbing maximum force in a controlled manner, minimizing energy transferred to the child. This unique behavior helps to protect your child from impact forces which may reduce the risk of suffering a life-changing injury.
The Knox fit inlay provides an excellent fit for smaller children and must be used from 14 to approximately 25 pounds. It ensures proper positioning of the child relative to the harness and crotch buckle.
Check your vehicle owner’s manual for vehicle top tether anchor locations. They are often found in sedans behind the backseat headrest or in other vehicles behind the seat back.
Quick Links
Parenthood, Understood.
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Family, First
One-On-One Customer Service
Whether it’s via Email, Text, Call, Live Chat, Video Chat, or Virtual Consultation, our exceptional Customer Experience Team is here to help you all day, every day, in every way.
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The UPPAbaby Promise
Unmatched Warranty Coverage
UPPAbaby has confidence in the quality of our products, and we are proud to offer warranty programs on all juvenile gear and accessories.
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Where to Find Us
Hub locations + Tune-Up Gear-Up events
Whether at one of our Hub Service Center & Showrooms or an event on the go, our helpful team of experts will have all the answers so you can make your purchase with confidence.