UPPAbaby KNOX Convertible Car Seats

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The UPPAbaby® KNOX® Convertible Car Seat

Over the past 15 years (and a little more), UPPAbaby has been quickly becoming a behemoth of the high-end baby industry. Let us introduce you to their entry for the convertible car seat category, the UPPAbaby KNOX. It is as strong and durable and fashionable and safe as what you have come to expect from all the different product lines designed and built by UPPAbaby. 

The KNOX is for your little one, starting at 14 pounds and growing with your child all the way until 65 pounds or 49” in height (whichever comes first). In simple terms, this convertible car seat is going to be with your child until they are ready for a booster car seat many years down the road. It’s stylish, sophisticated, and safe--which is really the crux of what UPPAbaby is all about. 

Why Parents Target the UPPAbaby KNOX Convertible Car Seat

The UPPAbaby KNOX convertible car seat offers a few unique features, as well as that style and comfort that everyone loves from UPPAbaby. The price point is a bit higher than other brands’ offerings at the convertible car seat level, but the return on investment is higher. The seat is more comfortable. It’s safer. It does what all of the other convertible car seats do, but it does it solidly and then goes above and beyond with additional features that you cannot find anywhere else.

The KNOX offers a Koroyd crash-protection technology based on aerospace science. These honeycomb-like collapsible cylindrical tube structures absorb energy in a crash. Koroyd designs and engineers this material for advanced impact protection for a diverse range of markets and products. You’d most likely find their technology in industrial uses and in protective sports equipment, but they do a heck of a job keeping the UPPAbaby KNOX car seat safe, as well. 

The KNOX is also one of the few car seats available that allows for a multi-directional tether strap. This can be used to improve safety for a rear-facing installation (as the KNOX can be used as both a rear-facing and front-facing car seat). 

UPPAbaby KNOX Car Seat Safety

The KNOX is one of the safer car seats on the market, and goes a bit beyond what is expected of a top-of-the-line car seat to deliver the results today’s parents are looking for. For example, due to the use of merino wool, the seat passes federal safety standards without the use of fire retardant chemicals. 

Furthermore, UPPAbaby offers a limited lifetime warranty on all car seats. 

There was a 2020 recall for the KNOX. It was a voluntary recall from UPPAbaby and was not based on any injury reports, but rather UPPAbaby’s own testing identified that in the rear-facing position, the KNOX had too much lateral motion. So yes, two months or so into the launch of the KNOX, it was already recalled. This may have made some parents a bit nervous, but we like to think that a company that is proactive and, regardless of the cost of a voluntary recall, isn’t afraid to say “we can do better” is someone worth buying from. If they make good on that promise and actually improve their product, then that’s a real vote of confidence from our perspective. UPPAbaby did just that, and their commitment to the best products on the market is notable. Since then, the KNOX has seen tremendous success as a convertible car seat.

The KNOX is FAA certified for aircraft use. 

The UPPAbaby KNOX Color Selections

The Car Seat Color Selections Include:

  • Bryce (White and Grey Marl)
  • Jake (Black Melange)
  • Jordan (Charcoal Melange Wool with Citron Accent)
  • Lucca (Teal Melange)


  • 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)

Why We Stand Behind the UPPAbaby KNOX Convertible Car Seat

Safety. Design. Luxury features. The KNOX is a beautiful result of the design and engineering prowess UPPAbaby is known for. The SMARTSecure System for visual confirmation of a correctly-installed car seat. The Koroyd technology is amazing. UPPAbaby uses EPP foam to absorb additional impact energy. Side-impact pods for more protection. Throw in a removable cup holder and make the fabric entirely washable, and there’s very little not to purchase the KNOX, if it is in your price range.