Cosatto Acorn i-Size Car Seat Base


Pair the Acorn i-Size Car Seat with the Acorn i-Size Base for ultra-convenience. If you’ve got ISOFIX anchors in your car, then just pop your car seat on and off your i-Size base. ISOFIX is minimal fuss?- just simplicity with a satisfying click that lets you know it’s fastened securely.


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  • Acorn i-Size Base
  • 4-Year Guarantee Card
  • Vehicle List
  • ISOFIX Guides

The Acorn i-Size has had extensive crash and safety testing as part of the latest R129 / i-Size standard. It is i-Size and ISOFIX when paired with the Acorn i-Size base (sold separately), delivering reduced car seat movement for total peace of mind. The Acorn i-Size car seat brings safety and security to your snug passenger. The Acorn i-Size car seat can also be fitted rearward facing using a standard 3-point seat belt.

The Acorn i-Size car seat has impact and protection at the core of its design. The i-Size standard takes testing further with side impact and roll over testing, all using the latest crash test dummies, to help create safer car seats. Acorn i-Size has a reinforced construction with a strong protective shell to encase your child. To deliver extra levels of safety, the Acorn i-Size has a flip-out Side Impact Protection System to absorb force in the event of a side impact.

The Acorn i-Size will transform travel for you and your baby. The easy one-handed harness and headrest adjust allows you to position and adjust simultaneously to suit your child’s needs. This seat cocoons your newborn baby with the soft, removable ‘newborn nest’.

The Acorn i-Size car seat has been created using the ultimate high-performance, energy-absorbing materials, offering maximum protection for your baby. It comes with a UPF 100+ extendable canopy and much more. Easily removable, machine washable covers offer continual comfort.


  • Conforms to R129/03 standard
  • Compatible with Acorn i-Size car seat
  • Easy to install using ISOFIX points in the car
  • Has 5 visual indicators to confirm correct fitting in your car
  • Acorn i-Size base has a rebound bar and support-leg anti-rotation device to prevent car seat movement
  • Allows for Acorn i-Size car seat to be used with ISOFIX or i-Size
  • Collapsible leg for transportation and storage




i-Size Base Only – compatible with Acorn i-Size Car Seat


Product Weight 

  • 4.2 kg

Age Range

  • From 40cm to 87cm when used with the Acorn i-Size Seat * (Acorn i-Size seat sold separately)

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