*Returns not accepted on any opened, used, or defective product. Contact manufacturer directly for further instructions regarding defective products/parts. From Nuna, this booster features: Say goodbye to eye rolls and the 'too old for this' debate. Say hello to a seat that finally speaks their language. The LUMN is a combination seat that matches their big kid style, keeping up with all their growth spurts and bringing the coolness factor. Recommended use:To use this child restraint, your child must meet BOTH the weight and height requirements: Weight: 30-110 lb, Height: 34-57 in. In harness mode, child must be at least 30 lbs up to 65 lbs and between 34-49" tall. In booster mode, child must be at least 40 lbs up to 110 lbs and between 43-57" tall. Use Harness to booster taking them from little kid to bigger kid in stylish security 5-point no-rethread harness stows away when converting to booster 9 recline options in both harness and booster modes when tethered Bubble-free recline guides confirm the perfect riding angle 10-position height-adjustable headrest to accommodate growth Machine-washable fabrics and inserts seat pad removes separately for added convenience Slim design fits 3 across in most mid-sized vehicles Designed for longevity with up to a 10-year life span Airline approved and FAA-certified for use in harness mode Safety All-steel frame and reinforced belt path for superior protection Aeroflex™ side impact protection system uses lightweight EPP foam to absorb energy and minimize force transferred during a side-impact collision Certified to latest side and frontal impact standards (FMVSS No. 213a and 213b) True tension™ door for a secure install in harness mode Open belt path provides an easier path for booster-mode buckling Push on latch connectors secure the car seat to the vehicle anchor points Comfort Ergonomic armrests are padded for extra comfort All-weather micro knit fabric provides all-season comfort Leatherette-wrapped calf support for comfort that grows with them Premium Details Smart design and long-term security with a coolness factor Sleek automotive-style leatherette accents create a big kid appeal Pop-out cup holders are removable and hand washable Fire-retardant free: from fabric to foam and beyond, each element is smartly sourced to be both flame resistant and contain no added fire-retardant chemicals GREENGUARD Gold Certified: Products that have achieved GREENGUARD Gold Certification are scientifically proven to meet some of the world's most rigorous third-party chemical emissions standards, and certified to not contribute to indoor air pollution or chemical exposure Car seat dimensions (highest position) L 26.25 in x W 18.25 in x H 32.5 in Car seat dimensions (lowest position) L 23.5 in x W 18.25 in x H 25.5 in Weight: 26.2 lbs Imported.