Harmony Defender 360 MAX SIP 3-in-1 Car Seat, Fits Kids 27"-57"

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.