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Defender 360° MAX - Midnight/White

3-in-1 Combination Deluxe Car Seat

For children 22 – 120 lbs. (12 – 54 kg) | 27-57 in (68.6 – 144.8cm)

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

Maximum protection

The Defender 360 MAX car seat is engineered for ultimate protection, exceeding both Canadian CMVSS 213 and U.S. FMVSS 213 safety standards. With its advanced design, it provides 360 degrees of full-body protection, ensuring maximum safety for your child’s head, torso, and legs.

Maximum comfort

The 9-position headrest height adjustment ensures a customized fit as they grow, while the ultra-plush fabric seat cover provides a soft, cozy feel. Beneath the surface, EPE energy-absorbing foam enhances both comfort and safety, creating a cushioned ride that keeps your little one snug and supported at all times.

Maximum ease-of-use

The no re-thread harness adjustment and up-front harness adjuster allow for quick, hassle-free modifications as your child grows. Cleanup is a breeze with easily removable, machine-washable fabric seat covers, ensuring a fresh and comfortable ride. Plus, the visually pronounced belt guides make seat belt routing and installation intuitive, giving you confidence that your child is always securely positioned.

Anti-torque backrest

The Defender 360 MAX car seat’s innovative anti-torque backrest enhances safety by reducing rotational forces in the event of a collision, helping to keep your child’s head, neck, and spine properly aligned. This added stability not only improves crash performance but also ensures a more secure and supportive seating experience, giving parents extra peace of mind on every journey.

Additional features

Ultra-plush seat cover made with premium fabrics

Unique recline system

Removable & machine washable premium seat cover

LATCH & 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

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