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Nuna LUMN Harness-to-Booster Car Seat

The Nuna LUMN is a premium combination car seat that transforms from a forward-facing 5-point harness to a belt-positioning booster. It is designed for children from 30 to 110 pounds and offers a 10-year lifespan. Its key features include an all-steel frame, True Tension™ installation, GREENGUARD Gold certification, and a slim design that can fit three-across in most mid-sized vehicles. This seat is the ideal choice for parents seeking maximum safety, long-term value, and a stylish, comfortable ride from one of the most sought-after brands for their growing child.

The Ultimate "Big Kid" Upgrade

You've navigated the infant bucket seat and mastered the convertible. Now your child is entering a new phase—one with opinions, growth spurts, and a desire (demand?) to be seen as a "big kid." The Nuna LUMN is engineered for this exact moment, giving you parent-obsessed safety with kid-approved style and comfort. It's the car seat they'll actually be excited to use instead of one that they dread.

A Seat That Speaks Their Language

The LUMN’s sleek, automotive-style leatherette accents and clean lines give it a mature appeal that children recognize. It doesn't look like a "baby seat." It looks like their seat. The padded, ergonomic armrests and pop-out cup holders give them a sense of independence and control over their space.

First-Class Comfort for Every Mile

Long road trips and daily commutes are easier when your child is comfortable. The LUMN features an adjustable leg rest for customized calf support, preventing dangling legs and uncomfortable drives. With 9 recline positions available (yes, even when tethered), your child can find the perfect angle for napping or sightseeing. The all-weather micro-knit fabric is breathable and soft, bringing comfort to any season. As one parent noted, "It looks like our daughter was riding on a flight first class."

Slim Design, Big Possibilities

Growing families and carpools require smart solutions. The LUMN features a slim-profile design measuring just 18.25 inches wide. This thoughtful engineering allows you to comfortably fit three LUMN seats across the back of most mid-sized vehicles, from a Tesla Model Y to a Honda Odyssey, without compromising safety or comfort.

Meet the Nuna LUMN Collection at Albee Baby

Choose the style that best fits your car and your child's personality. Every Nuna LUMN includes two pop-out cup holders and is backed by a 10-year lifespan.

  • Nuna LUMN in Caviar: A timeless, deep black that offers a sophisticated and clean look.
  • Nuna LUMN in Granite: A rich, dark grey that masterfully hides crumbs and complements modern vehicle interiors.
  • Nuna LUMN in Cedar: A warm, earthy tone that adds a touch of unique style to your backseat.

Engineered to Prevent Worry

The Nuna LUMN's premium price reflects what you have come to expect from this brand in regard to safety. Nuna goes well beyond standard testing to provide structural integrity and protection you can feel.

  • The (Car Seat) of Steel: At the core of the LUMN is an all-steel frame with a reinforced belt path. This provides superior structural resistance during a crash, absorbing impact forces and maintaining the integrity of the seating area to protect your child.
  • True Tension™ Door: Over 46% of car seats are installed incorrectly, significantly reducing their effectiveness (Source: NHTSA). Nuna's True Tension™ door system simplifies installation. Just route the vehicle seat belt through the open door, buckle it, and close the door to lock the belt securely in place. This system removes the guesswork and ensures a tight, confident installation.
  • Aeroflex™ Side Impact Protection (SIP): The LUMN features Aeroflex™ EPP foam in its side impact protection (SIP) pods. This high-grade, lightweight foam is incredibly effective at absorbing and diffusing energy during a side-impact collision, minimizing the force transferred to your child.
  • GREENGUARD Gold Certified: Your child's environment matters. From the fabric to the foam, every element in the Nuna LUMN is smartly sourced to be flame resistant without any added fire-retardant chemicals. It is also GREENGUARD Gold Certified, meaning it's scientifically proven to meet the world's most rigorous standards for low chemical emissions, ensuring it won't contribute to indoor air pollution.

From 5-Point Harness to Belt-Positioning Booster

The Nuna LUMN is an investment designed to last. It seamlessly transitions with your child's growth, providing a decade of use from one smart purchase.

Harness Mode: Secure for Your Little Kid (30-65 lbs.)

For children between 30-65 pounds and 34-49 inches, the 5-point no-rethread harness provides the highest level of safety. The harness is easy to adjust as your child grows and features padded covers for comfort. When it's time to transition, the harness system stows away neatly within the seat, which is really convenient.

Booster Mode: Independence for Your Bigger Kid (40-110 lbs.)

Once your child reaches at least 40 pounds and is between 43-57 inches, the LUMN transforms into a high-back belt-positioning booster. The open belt path and clear color-coded guides empower your child to learn how to buckle themselves in safely, using the vehicle's own seat belt.

One-Hand, 10-Position Headrest for the Perfect Fit

A proper fit is essential for both safety and comfort. The headrest adjusts with just one hand through 10 different height positions, ensuring the shoulder belt is always positioned correctly across your child's collarbone as they grow.

Product Line Specifications

  • Harness Mode Usage: For children from 30–65 lbs and 34–49 inches tall.
  • Booster Mode Usage: For children from 40–110 lbs and 43–57 inches tall.
  • Product Weight: 26.2 lbs.
  • Product Dimensions: 25.5–32.5” H x 23.5–26.25” L x 18.25” W.
  • Lifespan: 10 years from the date of purchase.
  • FAA Certified: Yes, approved for aircraft use when in harness mode.
  • What's Included: Nuna LUMN Car Seat and two pop-out cup holders.

Why the Nuna LUMN is a Great Purchase

Investing in a premium car seat is a decision first about safety, but then value and daily convenience are also very important. The Nuna LUMN excels in all three areas, making it a purchase you can feel good about for years to come.

  • Long-Term Value: With a 10-year lifespan, the LUMN is built to be the final car seat your child will ever need. It covers the entire period from when they outgrow their convertible seat until they can safely use the vehicle's seat belt alone, offering incredible value over its lifetime.
  • Premium Materials and Effortless Cleanup: Life with kids is messy. The LUMN is designed for it. The high-quality micro-knit fabric and leatherette accents are durable and easy to wipe clean. For bigger messes, the seat pad is fully machine-washable.
  • Features That Truly Matter: From the True Tension™ door that simplifies installation to the adjustable leg rest that enhances comfort, every feature on the LUMN is designed with a purpose. There are no gimmicks.

Frequently Asked Questions about the Nuna LUMN

Q. Is the Nuna LUMN worth the extra cost compared to the Nuna AACE?
A: The LUMN is worth it for parents prioritizing an all-steel frame for maximum structural integrity and the True Tension™ door for a foolproof (harness) installation. The AACE is an excellent booster, but the LUMN provides a more robust harness-mode experience with more premium features like the leg rest.

Q: How hard is it to install the Nuna LUMN?
A: The LUMN is designed for an easy and secure installation. In harness mode, the True Tension™ door simplifies the process of using a vehicle seat belt. In booster mode, the push-on LATCH connectors keep the seat stable for your child to climb in and out.

Q: Will the Nuna LUMN fit in my car with two other car seats?
A: With a width of only 18.25 inches, the LUMN is one of the slimmest combination seats available. It is designed to fit 3-across in most mid-sized vehicles. We always recommend measuring your back seat to confirm.

Q: What is the main benefit of the adjustable leg rest?
A: The leg rest provides ergonomic support for a child's legs, preventing them from dangling uncomfortably on long rides. This improves circulation and overall comfort, reducing restlessness and complaints.

Q: How do you clean the Nuna LUMN?
A: The fabrics and inserts are machine washable on a delicate cycle (cold water, mild detergent, lay flat to dry). The plastic and leatherette components can be wiped clean with a damp cloth.

Q: Can I use the Nuna LUMN on an airplane?
A: Yes, the Nuna LUMN is FAA certified for use on aircraft when in harness mode. It is not certified for use in booster mode, as booster seats require a lap-and-shoulder belt.

Shop the Nuna LUMN at Albee Baby

So let's take a look at what makes shopping for the LUMN different at Albee Baby than anywhere else. First, we have an industry-leading rewards program where you can get up to 20% back. Next, there's fast, free shipping over $99 (but be mindful in the few instances that the item is shipping from the manufacturer or backordered--in which case it may take more than a few days) (sometimes supply runs out in our industry). We're a family owned business that's been around since 1933, and we are honored to be here today to help you on your path, as well.

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