Harmony Defender 360 MAX SIP 3-in-1 Combination Deluxe Harnessed Booster Car Seat - Black

Safety, comfort, and innovation come together in the Harmony Defender MAX SIP, a next-generation car seat designed to give parents peace of mind and children a secure, comfortable ride. Engineered for longevity, it grows with your child from a forward-facing harnessed seat to a high-back booster and finally to a backless booster—providing years of reliable protection.

As one of the first car seats to meet the new U.S. side-impact safety standards, the Defender MAX SIP sets a new benchmark in child passenger safety. Its full-body impact protection, anti-torque backrest and headrest, and energy-absorbing EPE foam work together to minimize crash forces, ensuring your child is surrounded by top-tier protection at every stage.

Designed with parents in mind, this seat features a 1-hand, no-rethread harness height adjustment, 9-position adjustable head support, and an infinite-recline system—allowing for quick, hassle-free adjustments as your child grows. The UAS/LATCH and top tether system makes installation secure and straightforward, while the visually pronounced belt guides help ensure correct seat belt placement in booster mode.

For all-day comfort, the ultra-plush, premium fabric seat pad is soft yet durable, with removable, machine-washable covers for easy cleanup. An optional interchangeable cup/snack holder keeps drinks and snacks within reach, while the V-shape design and inclined seat plane promote a secure fit and proper positioning.

Recognized as an IIHS Best Bet Booster and awarded by Baby Consumers and Babble as a top-rated car seat, the Defender MAX SIP delivers a level of protection and convenience that families can trust. With advanced side-impact protection and a modern, contoured design, it’s built to keep your child safe—and to set a new standard in car seat safety.