Maxi Cosi I-Size isofix bases. These bases work with a number of Maxi Cosi infant and Toddler car seats.
The Babyfix base works only with infant car seats including the Rock, Pebble Plus and Jade car cot. This leaves you free to choose any Toddler car seat including swivel seats
The 3wayFix base gives you longevity as not only will it fir the infant car seats as per the Babyfix above it will also take the next stage toddler car seats including the Pear Smart and Pearl Pro, lasting up to 105cms. So this base works from birth to around 4 years.