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LUMN Harness to Booster Car Seat

Nuna

Current Price $680.00
Color: Caviar
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Details & care

Give them a luxe, safe ride every day from toddlerhood until their big enough to ride without a booster seat in the new LUMN, built to transition from front-facing harness car seat to reclining booster seat and built to last up to 10 years.

Why parents will love it: Perfect for growing kids and growing families, this harness-to-booster seat is all you'll need from the moment your child(ren) is(are) ready to ride in a front-facing car seat. Easy installation and a space-saving design allow for quick, convenient vehicle switching and up to three seats across in most midsize automobiles. Washable materials keep it easy to keep this seat looking good for the long run.

Why kids will love it: Nine reclining positions, a 10-position height-adjustable headrest, onboard cupholders and luxe, comfortable materials keep them happy to ride along on any and all family outings from in-town errands to out-of-town adventures. They may even be reluctant to give up this seat once they graduate out of needing it.

Child weight/height: 30–65 lb., 34"–49" in harness mode; 40–110 lb., 43"–57" in booster mode.

Car seat weight/dimensions: 26.2 lb., 25.5"–32.5" x 23.5"–26.25" x 18.25" dimensions.

Safety features: All-steel frame and reinforced belt path for superior protection; Aeroflex™ side impact protection system uses lightweight EPP foam to absorb energy and minimize force transferred during a side-impact collision; certified to latest side and frontal impact standards (FMVSS No. 213a and 213b); airline approved and FAA-certified for use in harness mode.

Harness: 5-point no-rethread harness stows away when converting to booster.

Car installation: Push on latch connectors secure the car seat to the vehicle anchor points; True tension™ door for a secure install in harness mode; bubble-free recline guides confirm the perfect riding angle.

  • This car seat is eligible for return in its original, unopened box only
  • Pop-out cupholders are removable and hand washable
  • Fire-retardant free
  • All-weather microknit fabric provides all-season comfort
  • Leatherette-wrapped calf support for comfort that grows with them
  • Machine-washable fabrics and inserts; seat pad removes separately for added convenience
  • Steel/textile/plastic/foam
  • Imported
  • Item #10730557
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Nuna

Inspired by the clean lines and ingenuity of Dutch design, nuna offers baby gear that’s simple, practical and stylish. Each and every product is designed to include thoughtful solutions to make family life that much easier. From high chairs and strollers to travel cribs and car seats, nuna provides premium baby gear you and yours can trust for years to come, designed around your life.

Reviews

(33)
4.8 out of 5
Write a Review

Most helpful positive review

May 13, 2025
Perfect "Big Kid" car seat after the convertible
I’ve installed and used this seat for about a week now, and love it. I have a Model Y that has been hard to get a good car seat install in, and this is exactly what I was looking for. It was shockingly easy to install securely on the first try (and I’ve installed other Nuna seats) and aligns with the interior style of the car. My child has a long torso and I love that at an 18.5” harness height this will fit longer than convertible seats. My child had already outgrown the Rava in harness height when I flipped them forward facing, despite being well within the limits, but isn’t ready for a booster. This is comfy and cozy, and the footrest and cup holders in particular were a big hit with my child, who calls it a “big kid seat”. I appreciate the "clean" fabric and love that this should last through the end of our car seat age. Pay attention to the minimum age (2), height (34"), and weight (30 lbs) minimums for this seat and ensure your child is ready for this style of seat. It's intended for kids that are close to or have outgrown a convertible seat but aren't yet ready for a booster seat. It's NOT designed, nor safe, for babies just transitioning from an infant bucket-style seat.
Kikikins1
15found this helpful

Most helpful critical review

Oct 10, 2025
Disappointed. Beautiful but rattles constantly
We bought this as a replacement to our Nuna exec car seat (replacing due to a traffic accident). After our great experience with the Exec we thought this would be the natural replacement. It’s a beautiful car seat and relatively quick an easy to install. Unfortunately though, the reclining tab produces an annoying constant rattle over any kind of rough terrain. We drive a luxury German vehicle which dampens most terrain so I’m very surprised how much this seat rattles. I reached out to customer support and they confirmed I do not have a defective unit and were unable to offer any solutions other than thanks for telling us. Long story short, disappointed for a premium, luxury, top of the line car seat.
Jebb846
10found this helpful
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Sort by Most Helpful
Color
Kikikins1
Color: Caviar
May 13, 2025
Perfect "Big Kid" car seat after the convertible
I’ve installed and used this seat for about a week now, and love it. I have a Model Y that has been hard to get a good car seat install in, and this is exactly what I was looking for. It was shockingly easy to install securely on the first try (and I’ve installed other Nuna seats) and aligns with the interior style of the car. My child has a long torso and I love that at an 18.5” harness height this will fit longer than convertible seats. My child had already outgrown the Rava in harness height when I flipped them forward facing, despite being well within the limits, but isn’t ready for a booster. This is comfy and cozy, and the footrest and cup holders in particular were a big hit with my child, who calls it a “big kid seat”. I appreciate the "clean" fabric and love that this should last through the end of our car seat age. Pay attention to the minimum age (2), height (34"), and weight (30 lbs) minimums for this seat and ensure your child is ready for this style of seat. It's intended for kids that are close to or have outgrown a convertible seat but aren't yet ready for a booster seat. It's NOT designed, nor safe, for babies just transitioning from an infant bucket-style seat.
15found this helpful
KimbElizGrah
Size purchased: One Size
Color: CEDAR
Apr 24, 2025
Recline prior to buckling in
My son is a little big for 15 months so I thought the LUMN might be too advanced for his age. Once I figured out how to recline it, I saw he’s definitely big enough with the (up to 40lb) insert. I suggest reclining it before you buckle it and secure the top anchor. Watch a video on it so you can see how to use all of the features of the LUMN, it saved me when I thought it wasn’t secure enough, turns out I didn’t buckle it properly. We’ve had it for 2 days now and this big boy loves it! His little wrist rolls chilling on the arm rest, cup holders fold down to give a little more space on the sides when not in use. Overall we’re loving it
12found this helpful
Jebb846
Color: Caviar
Oct 10, 2025
Disappointed. Beautiful but rattles constantly
We bought this as a replacement to our Nuna exec car seat (replacing due to a traffic accident). After our great experience with the Exec we thought this would be the natural replacement. It’s a beautiful car seat and relatively quick an easy to install. Unfortunately though, the reclining tab produces an annoying constant rattle over any kind of rough terrain. We drive a luxury German vehicle which dampens most terrain so I’m very surprised how much this seat rattles. I reached out to customer support and they confirmed I do not have a defective unit and were unable to offer any solutions other than thanks for telling us. Long story short, disappointed for a premium, luxury, top of the line car seat.
10found this helpful
Anonymous
Verified purchase
Jan 25, 2026
Luxurious and comfortable
Love the design, my son seems to be very comfortable in it.
Was this helpful?
Anonymous
Reposted from nunababy.com
Verified purchase
July 16, 2025
Nuna Lumn
We absolutely love the Nuna Lumn! The installation process is incredibly easy, making it a breeze to transition between vehicles. The convenience features, like its adjustable reclining positions and the stylish design, have been a hit with our family. But what truly stands out is the comfort it provides for our toddler—she loves settling in for the ride. The soft fabric and extra padding make every journey enjoyable, whether it's a quick trip to the store or a long road trip. It's a fantastic choice for families looking for safety and comfort! It also will be great once we are able to transition this seat to a high back booster.
McKinley D
Reposted from nunababy.com
Verified purchase
July 14, 2025
If you’re thinking about it - get it!
The best car seat! Went from Revv (loved) to this and so so happy with it for the upgraded, last longer seat. My kiddo loves it too and loves his “armrests”!!
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LUMN Harness to Booster Car Seat
Nuna
Current Price $680.00