Nuna LUMN Harness to Booster Car Seat

Nuna LUMN Harness-to-Booster Car Seat

The Nuna LUMN is made for that stage if growth when your child has outgrown his or her baby seat but still needs a solid forward-facing seat for everyday safety and comfort. The LUMN starts as a forward-facing harness car seat and then transitions to a belt-positioning booster, giving you years of reliable use. And you’ll love it–the leatherette calf support and the ergonomic armrests and premium, fire-retardant-free fabrics, . . . everything about this seat delivers smart design and serious comfort.

What You’ll Love About the LUMN as a Parent

This seat is designed to take the hassle out of buying that second seat—starting from 30 lbs. in harness mode and going up to 110 lbs. in booster mode, you’re not going to be buying another seat after this. The no-rethread 5-point harness tucks away when it’s time to transition, too. The LUMN comes with 10 headrest positions, 9 recline settings when tethered, and bubble-free recline guides so you can dial in the right fit at every stage. The slim frame fits 3 across in most mid-sized vehicles, and the seat pad removes for easy machine-washing. You’ll also appreciate the dual cup holders that pop out when needed and tuck away when you want more room.

The seat is FAA-certified for airline travel in harness mode and built to last up to 10 years.

Safety You Can Count On

The LUMN uses an all-steel frame with a reinforced belt path for solid, day-to-day strength. Nuna’s Aeroflex™ side impact protection uses EPP foam to help absorb energy during a crash. The True tension™ door makes installation in harness mode simple and secure, and push-on LATCH connectors lock the seat into your car’s anchors. The booster mode features an open belt path for easier buckling. It’s also GREENGUARD Gold Certified and contains no added fire-retardant chemicals.

Certified to the latest FMVSS No. 213a and 213b crash standards, the LUMN is built to meet Nuna’s high bar for protection, quality, and chemical safety.

What Parents Are Saying

Parents love how well this seat balances comfort and peace of mind. One reviewer shared, “We’ve had it for two days now and this big boy loves it!” Another parent added that the cup holders and padding make every ride better, and that watching an install video helped them get the setup just right.

Product Specs

• Use: Forward-facing harness: 30–65 lbs. | Booster mode: 40–110 lbs.
  
• Height range: 34–49" (harness mode), 43–57" (booster mode)
  
• Harness: 5-point no-rethread harness
  
• Recline options: 9 positions (in both harness and booster modes when tethered)
  
• Headrest: 10-position adjustable headrest
  
• Install features: True tension™ door, bubble-free guides, push-on LATCH
  
• Safety: All-steel frame, Aeroflex™ side impact protection, GREENGUARD Gold Certified, FMVSS 213a/213b
  
• Comfort: Micro knit fabric, ergonomic armrests, leatherette calf support
  
• Extras: Two removable, hand-washable pop-out cup holders
• Dimensions: Slim fit (3-across compatible in most mid-sized vehicles)
  
• Lifespan: Up to 10 years
  
• Certifications: FAA-certified for harness mode
  
• Care: Machine-washable seat pad and inserts

Shop the Nuna LUMN at Albee Baby

If you're looking for a forward-facing car seat that brings top-tier safety, style, and long-lasting value, the Nuna LUMN checks every box. With its slim profile, intuitive install, and comfort-focused design, it's a smart choice for families who want peace of mind and a high-fashion, premium seat. Explore all available colors and get fast, free shipping on orders over $99.