The Pinnacle is a Convertible Booster Seat that is suitable for children aged approximately 6 – months to 8 – years. First used as a harnessed car seat with the in – built six – point harness. Once the child’s shoulder meets the middle shoulder height marker, it is then converted into a Booster Seat used with the vehicle’s lap & sash seatbelt. Features an adjustable, locking headrest this car seat is able to grow with your child. In Booster Seat mode. The Pinnacle also includes our new advanced buckle. The new buckle independently locks each buckle tongue separately, unlike traditional buckles that require you to insert both tongues to engage the lock. This helps eliminate situations where a buckle isn’t engaged and may pop out. Air Cocoon Technology (A.C.T) The Aspect featuresAir Cocoon Technology (A.C.T.). This enhances side impact protection through blow moulding design. This dramatically reduces the impact forces during a crash. The headrest side wings act like airbags, which reduce the forces on your child’s head in a side – impact accident. No need for add – on pads or cushions. The machine – washable covers and inserts can easily be removed for cleaning. Features Forward Facing with in – built six – point harness from 6 – months to 4 – years – old Forward Facing with adult lap & sash seatbelt from 4 to 8 – years – old Air Cocoon Technology (A.C.T.) integrated Comfort Infant Insert, Shoulder Pads, Head Pillow & Crotch Buckle Pad included Adjustable, locking headrest Easy install belt path Foldable – for quick & easy storage and transport In – built Anti – Submarine Design Vehicle Seat Protector included SafeGrip Belt Clamp included Dimensions Width (Base) – 44cm Height (Headrest Down) – 76cm Height (Headrest Up) – 86cm Depth (Seat Base) – 40cm Approximate Shoulder Height Marker Locations Lower Marker (Start Use) – 29cm Middle Marker (Convert to Booster) – 42cm Upper Marker (Stop Use) – 57cm