UPPAbaby KNOX Convertible Car Seat



The KNOX is UPPAbaby's first convertible car seat that grows with your child through toddlerhood and beyond, from 14 to 65 pounds or 49" in height.

The UPPAbaby KNOX includes unique safety features not seen on other convertible car seats, like a multi-directional tether and Koroyd crash-protection technology developed from aerospace safety research.

The tether strap, used for both rear-facing and forward-facing installations, acts like a load leg, anchoring the seat to prevent it from rotating in a collision and causing injury to the child's head and neck. In rear-facing mode, the tether reduced the risk of injury by 45 percent in crash tests.

The base of the UPPAbaby KNOX includes Koroyd technology, seen in sporting goods and high-performance helmets, which crumples instantly on impact to absorb energy and slow forces in a crash.

Throughout the core and headrest of the seat, the UPPAbaby KNOX is fully lined with EPP, the toughest type of foam. Side impact pods on the sides of the seat serve as the first line of defense in a crash, helping to disperse forces away from your child.

It's easy to tell if the UPPAbaby KNOX is installed correctly, thanks to the SmartSecure tightness indicator and a recline indicator that shows safe positions for rear-facing and forward-facing. Features like multiple recline positions and a no-rethread harness add convenience to your daily outings.

The Jordan Charcoal Melange color of the KNOX is made with merino wool, a fiber that is breathable, hypoallergenic and naturally fire-resistant.



  • Converts from rear-facing to forward-facing, growing with your child from 14 to 65 pounds
  • Koroyd, a welded tube structure in the base of the seat, provides crash impact protection by crumpling on impact to absorb crash forces and reduce acceleration
  • Multi-directional tether, used for both rear-facing and forward-facing installations, inhibits rotation of the seat in the event of a crash and reduces forces by 45 percent rear-facing
  • EPP foam integrated into side impact pods and along seat shell absorbs forces in a collision
  • Active Response Headrest uses the absorption and recovery properties of foam to protect your child's head and neck
  • SMARTSecure system includes visual indicators that turn from red to green to signal a safe installation
  • 4 recline positions offer recline range of 32 degrees
  • Storage pockets keep harness buckles out of the way for convenient entry and exit
  • Seat fabric is easily removable and machine-washable
  • Bead levels and 4-position adjustable foot ensure that the car seat is level
  • Color-coded seatbelt paths make installation easy to understand
  • 8-position, no-rethread harness adjusts with headrest
  • 2-piece fit inlay provides options for a proper fit in the harness


  • Infant insert usage: 14 to 25 pounds
  • Rear-facing: 14 to 45 pounds (with fit inlay: 14 to 25 pounds); up to 49" in height
  • Forward-facing: 25 to 65 pounds; up to 49" in height
  • Dimensions: 23.8"L x 18.8"W x 27.4-32.5"H
  • Warranty: Limited lifetime warranty through UPPAbaby

Shipping Information

Most orders are shipped via FedEx Ground from our warehouse in Scottsdale, Arizona within 1 business day.

In some cases, Strolleria will dropship an order directly from the manufacturer to the customer to shorten the delivery time. In these instances, items typically ship within three business days, but the total delivery time is reduced.

Please see this page for the number of days it takes for products shipped via FedEx Ground from Scottsdale to arrive at your location. FedEx delivers packages on Saturdays and Sundays in most cities, excluding rural areas.

Return Policy

Strolleria accepts returns of new, unused items that are returned to us within 60 days of receipt. 

Because safety is a top priority for us and all new parents, Strolleria only accepts returns of items that have never been used. Items must be returned in the same condition in which you received them, including the original packaging.

All products sold by Strolleria are covered under a manufacturer's warranty. If the product is defective or becomes damaged during the warranty period, the manufacturer will send a repair or replacement part at no cost.

Visit this page for our complete return policy.


Customer Reviews

Based on 56 reviews
Evan L.
Great car seat

Very happy with all of our Uppababy products. Decided to stick with them as we transitioned from the infant car seat. Easy install with LATCH. Seems easy with seatbelt but can’t confirm. Baby likes it a lot more than the last one.

Darlene M

Wow! What a step up for my forward facing big girl. This car seat is so safe, secure, and beautiful. My daughter is so much more comfortable and does longer rides with more ease. Highly recommend this car seat!

John Mortimer
Needs improvement

Very difficult to install. Very heavy. I’m a big guy and putting enough pressure on the seat to see green is very difficult. If you are putting this in your car/truck and never removing it, you may be fine.

Laura Tancrelle
Gorgeous seat with a few quirks

I received this seat as part of the Stellar Test Panel and was so excited when I saw it. It's so classy and attractive. I also love a seat with built in installation indicators and extra features to get a tight fit, which this one has. Unfortunately I had a tough time getting it installed appropriately where I wanted in my car. I wanted it in the second row of my SUV so that I could easily buckle in my toddler, but after I strung the lap belt through the seat, I noticed there was no way I could get the belt under the tensioning bar as required because the belt just happened to be triple layered at that exact point. When I moved it to the back row I was able to install it without this problem, but that meant I had to put in my toddler through the trunk which isn't ideal. With that being said, my son LOVES the seat and seems super comfy, he didn't complain at all on an hour long ride! The side pockets to store the harness clips when not in use are so helpful. I also love the idea of the green panel that tells you if it's installed well, but I couldn't get mine to turn green even if it was in super tight. Overall it's a great seat with a few problems that I think they could easily fix.

Heather Wolfe
Great overall - for a large SUV

I was very excited to receive this seat as part of the Stellar Product Testing Panel. The fabric and overall look is really neutral, modern, and appears well-constructed. It was easy for me (at 20 weeks pregnant, no less!) to install by myself following the directions and the visual indicators. The multi-directional tether is nicer than other ones I have seen to use and I appreciate the velcro to wrap up the excess strap. The seat is easy for my four-year-old to get in and out of and he can also buckle and unbuckle himself as the buckles are easier to maneuver than other seats we have used, which he loves. My son is 46 inches and this is a very tall seat - it fit great in my Volkswagen Atlas but I wonder if it would be as easy to fit in a smaller car. My only real complaint is the cover for the seat buckle keeps coming out of the seat and covers the button. I have to push it back into the seat every other time we use it! If this gets fixed, this seat will be nearly perfect.