Skip to content

Defender 360° MAX – Midnight

3-in-1 Combination Deluxe Car Seat

For children 22 – 120 lbs. (10 – 54 kg) | 27-57 in (68.6 – 144.8 cm)

Safety, comfort, and ease of use—everything you need in a car seat, all in one. The Defender 360 MAX 3-in-1 Harnessed Booster Car Seat is thoughtfully designed to grow with your child, providing exceptional protection from toddlerhood through grade school. With its effortless installation and proven, parent-approved design, this car seat ensures a secure and stress-free ride, every time.

The versatile 3-in-1 design transitions seamlessly from a 5-point harness to a high-back booster and then to a backless booster, making it the only seat your child will ever need. Featuring the smoothest, most intuitive no-rethread harness height adjuster, a contoured seat-saver design, and a unique V-shape for a secure fit, installation is a breeze. And with plush, machine-washable fabrics and high-density comfort foam, your little one will ride in complete comfort on every journey.

Recognized as a leader in child safety, the Defender 360 MAX has been awarded the IIHS Best Bet Booster award for belt fit and has received top accolades, including Babble’s Best Convertible Car Seat and Baby Consumers Best Car Seat. Designed with full-body impact protection, this seat offers unmatched security for your child—giving you peace of mind on every drive.

At Harmony Juvenile Products, we’re more than just a brand—we’re parents, too. Our mission is to create safe, comfortable, and thoughtfully designed products that allow families to enjoy every adventure with confidence. Wherever the road takes you, trust the Defender 360 MAX to protect what matters most.

Product Features

  • IIHS BEST BET booster rating for both high-back and backless modes.
  • Complies with Canadian CMVSS 213 and USA FMVSS 213 standards
  • 3-in-1 car seat: 5-point harness, high-back, and backless booster.
  • The forward-facing Harness mode fits children from 22 – 65 pounds (10 – 29.5 kg) and 27 – 57 inches (68.6 – 144.8 cm) tall.
  • The forward-facing Booster modes without harness (high-back or backless) fit children from 40 – 120 pounds (18.1 – 54 kg) and 34 – 57 inches (86.4 – 144.8 cm) tall.
  • 360° of full-body protection guarantees maximum safety to your child’s head, torso, and legs.
  • Deep, supportive headrest, backrest, and seat base for 360° of immediate crash protection from front, rear and side-impact collisions.
  • The unique V-shaped, smooth-contoured seat design protects your car’s upholstery and is a much-needed space-saver, allowing a better fit in any type of vehicle and easy access to the UAS belt.
  • EPE energy-absorbing foam in headrest, backrest, and base.
  • Top Tether and UAS (Universal Anchorage System) equipped.
  • 1-hand, no re-thread height adjustment harness.
  • 9-position, 1-hand height adjustable headrest; extends to 29″.
  • Up-front, 1-hand harness adjuster.
  • Anti-torque design.
  • The ultra-plush seat pad, made with durable, premium fabric and extra foam, provides maximum comfort and is removable for washing.
  • Shoulder and crotch pads are included.
  • The unique recline system offers a multitude of recline positions.
  • The visually pronounced belt guides promote correct installment of the seat belt.
  • Comes with a practical cup and/or snack holder that can be easily installed on either armrest.
  • Offered with a 1-year warranty.
Specifications  |  How-to & Support  |  Available at

Safety

Built with thoughtful engineering, the Defender 360° MAX surrounds your child with supportive padding, deep side wings, and EPE energy-absorbing foam at the head, torso, and legs. Its reinforced frame pairs with UAS and Top Tether connectors to support a snug, stable installation. With an IIHS BEST BET booster rating, it’s a well-rounded choice for everyday travel.

Comfort

Long rides are no problem with the ultra-plush, extra-padded seat, crafted from premium, durable fabric for long-lasting comfort. The adjustable headrest, multiple recline positions, and cushioned shoulder and crotch pads provide a custom fit that grows with your child, keeping them cozy and supported on every journey.

Ease-of-Use

Designed for hassle-free adjustments, the Defender 360° MAX features a one-hand, 9-position height-adjustable headrest, no-rethread harness, and up-front harness adjuster for quick, effortless customization. The space-saving V-shaped design allows for a better fit in your vehicle while ensuring easy access to the UAS belt for seamless installation.

Anti-Torque Backrest

Built with an anti-torque design, the Defender 360° MAX reduces rotational forces in the event of a collision, helping to stabilize the seat and enhance overall safety. This added reinforcement provides extra protection.

Additional features

Ultra-plush seat cover made with premium fabrics

Unique recline system

Removable & machine washable premium seat cover

UAS & Top Tether equipped

Specifications

Net weight: 8.3 kg (18 lbs.)
Gross weight: 9.6 kg (21 lbs.)

Replacement parts

Cup holder

Shoulder Belt Safety Guide with screw

Locking clip

Backrest connector rod, screw with washer

Reviews

Questions & Answers