The Graco Tranzitions 3-in-1 Harness Booster Car Seat is the perfect tool for busy parents to protect your child from toddler to youth: forward-facing harness (22-65 lb, up to 49"), highback booster (40-100 lb, 43-57"), and backless booster (40-100 lb, 43-57"). The adjustable No-Rethread Simply Safe Adjust Harness System lets you easily adjust the headrest and harness in one motion. It is also lightweight and portable to make traveling with your little one a breeze. The 8-position adjustable headrest is also adjustable with one hand and grows as your child grows. Please note, we do not guarantee compatibility.