One4Life Slim grows from rear-facing infant seat to forward-facing harness to high-back booster (5–120 lbs) with a slim 17.5"" SpaceSaver design and ClickTight installation for easy, secure setup.It features premium fabrics, SafeWash machine-washable cover, color-coded belt paths, slide-out cup holders, 15-position no-rethread harness, high-strength steel frame, SafeCell technology, and multiple comfort inserts.