Defender 360° 3-in-1 - Grey
3-in-1 Combination Car Seat
For children 22 – 110 lbs. (10 – 50 kg) | 27-57 in (68.6 – 144.8 cm)
Designed for modern families on the move, the Harmony Defender 360 3-in-1 Combination Car Seat is a versatile solution for everything from daily drop-offs to weekend getaways. This all-in-one design transitions from a 5-point harness to a highback booster and then to a backless booster, offering lasting use as your child grows.
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The Defender 360 includes practical, parent-approved features like a 1-touch, no-rethread harness height adjuster for quick and easy fit changes. A recline function, ultra-plush, machine-washable seat pad, and high-density comfort foam help keep your child comfortable on every ride.
Designed to meet established safety standards including CMVSS 213, FMVSS 213, and ECE regulations, the Defender 360 includes thoughtful structural elements such as a reinforced head and body area, energy-absorbing foam, and a no-torque backrest—all working together to support your child throughout their journey.
With its modern design, durable fabrics, and smooth-contoured seat-saver base to help protect your vehicle’s upholstery, the Defender 360 blends form and function. It’s also one of the few harnessed boosters that fits 3-across in most standard vehicles, making it a practical choice for growing families.
At Harmony Juvenile Products, we design with families in mind—creating dependable, comfortable products that make everyday travel a little easier.
Product Features
- IIHS (Insurance Institute for Highway Safety) ‘Best-Bet Award’ Winner.
- Baby Consumers: ‘Best 3-in-1 Car Seat Award’ 2016.
- Babble: ‘Best Convertible Car Seat Award’ 2015.
- Tested for structural integrity at energy levels approximately 2X the federal crash test standard.
- 3-in-1 deluxe car seat (5-point harness, high-back booster, backless booster).
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- Easily converts from a harnessed to a high-back and backless booster seat.
- Complies with Canadian CMVSS 213 standards, USA FMVSS 213 standards and European ECE standards.
- Rollover-tested with 5-point harness.
- Forward-facing only car seat.
- Fits children forward facing: 22 – 65 pounds (10 – 29.5 kg) and 27 – 57 inches (68.6 – 144.8 cm) WITH harness.
- Fits children forward facing: 40 – 110 pounds (18.1 – 50 kg) and 34 – 57 inches (86.4 – 144.8 cm) WITHOUT harness (Booster mode).
- 360° of full-body impact protection guarantees maximum safety to the head, torso and legs as your child grows.
- Deep, supportive headrest, backrest, and seat base for 360° of crash protection from front, rear and side-impact collisions.
- EPE energy-absorbing foam in headrest, backrest and base for added comfort and energy absorption in a crash.
- 1-touch, 9-position no re-thread harness height adjustment; Adjustable headrest extends to 73.6 cm (29 in.).
- Up-front 1-hand harness adjuster: Advanced smooth adjustment technology.
- Unique multi-position recline system.
- 3-across car seat capability in most vehicles.
- Premium ultra-plush seat pad and high-density comfort foam.
- 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.
- Visually pronounced belt guides promote correct installment of the seat belt.
- UAS/LATCH and Top Tether equipped.
- Cup and snack holder can easily be installed on either armrest.
- Deluxe padded harness covers and crotch pad.
- Machine washable seat pad designed to avoid having to remove the harness system for easy washing.
- Shoulder belt guide included.
- Anti-torque backrest keeps your child enclosed and protected in a collision.
- Aircraft certified in harness mode.
- 10-year expiry from date of manufacture.
- 1-year warranty.
Specifications | How-to & Support | Available at 
Safety
Thoughtfully built for comfort and support, the Defender 360° surrounds your child with deep padding and EPE energy-absorbing foam at the head, torso, and legs. Its reinforced structure is designed to help manage impact forces, while UAS and Top Tether connectors support a secure, stable installation. With an IIHS BEST BET booster rating, it’s a reliable choice for everyday travel.
Comfort
From daily commutes to long road trips, the Defender 360° keeps your child cozy with its ultra-plush, extra-padded seat and premium, durable fabric. The adjustable headrest, multiple recline positions, and cushioned shoulder and crotch pads provide a tailored fit that grows with your child, ensuring superior comfort at every stage.
Ease-of-Use
Parent-friendly features make adjustments effortless—no more struggling with straps or re-threading harnesses. The one-hand, 9-position height-adjustable headrest, up-front harness adjuster, and simple recline system allow for quick, hassle-free customization. Plus, the seat’s unique design saves space in your vehicle while providing easy access to the UAS belt for a seamless installation.
Anti-Torque Backrest
The Defender 360° features a thoughtful anti-torque design intended to help limit seat rotation during certain types of impact. Paired with a deep, reinforced shell, it offers added stability and structural support for your growing child.
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.)
How-to & support
Replacement parts
Cup holder
Shoulder Belt Safety Guide with screw
Locking clip
Backrest connector rod, screw with washer