Description
The Harmony® Defender 360 Max SIP 3-in-1 Harnessed Booster Car Seat is built to grow with your child, delivering safety, comfort, and long-term value from toddler years to grade school.
Designed with 360° full-body crash protection, it features energy-absorbing EPE foam in the headrest, backrest, and base to help protect against front, side, and rear impacts. Its IIHS Best Bet Booster rating ensures proper seat belt positioning as your child transitions through each stage.
This versatile 3-in-1 seat easily converts from a 5-point harness booster to a high-back and backless booster, eliminating the need for multiple car seats. The UAS/LATCH system with top tether allows quick, secure installation, while the 9-position no-rethread harness and one-hand adjustment make it easy to customize the fit as your child grows.
Comfort is built in with a plush, machine-washable seat pad, multiple recline positions, and a removable cup holder, making every ride more enjoyable. Its slim, space-saving design also allows three seats across in most vehicles.
Built to meet Canadian CMVSS 213.2 and U.S. FMVSS 213 standards, and designed for up to 10 years of use, this car seat offers reliable performance for everyday travel.
Harmony® is a trusted brand known for safe, innovative, and practical child products. Parents choose Harmony® for its proven safety, durability, and excellent value, making the Defender 360 Max a smart choice for growing families.
Key Features
- 3-in-1 design: harness booster, high-back booster, and backless booster
- IIHS Best Bet Booster rating in both booster modes
- 360° full-body crash protection with energy-absorbing EPE foam
- Secure UAS/LATCH system with top tether for stable installation
- 9-position no-rethread harness height adjustment
- One-hand harness adjustment for quick, easy fit
- Ultra-plush, machine washable seat pad
- Multiple recline positions for added comfort
- Removable cup/snack holder (installable on either side)
- Slim V-shaped design allows three seats across in most vehicles
- Complies with Canadian CMVSS 213.2 and U.S. FMVSS 213 standards
- Usable up to 10 years from date of manufacture
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3-in-1 Long-Term Use
Designed to grow with your child from a 5-point harness seat to a high-back booster and finally a backless booster for lasting value.
360° Full-Body Protection
Deep headrest, backrest, and seat base help provide enhanced protection for your child’s head, torso, and legs.
IIHS Best Bet Rated
Recognized with an IIHS Best Bet booster rating in both high-back and backless modes for excellent belt-positioning performance.
Easy One-Hand Adjustments
Features a no-rethread harness, adjustable headrest, and simple recline system to make everyday setup quicker and easier.
Specifications
- Harness Weight Range: up to 65 lb (29.5 kg)
- Product Width: approx. 17 in (43 cm)
- Product Height: approx. 28 in (71 cm)
- Product Depth: approx. 18 in (46 cm)
- Seat Weight: approx. 12 lb (5.4 kg)
Product Video
Download Instruction Manual
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