Koochi upstart isofix car seat base the koochi upstart 0car seat isofix base is ultra convenient if yoursquove got isofix anchor points in your car and nowadays most cars do then just pop your upstart 0 car seat on and off your in situ isofix base isofix is minimal faff just simplicity with a satisfying click that lets you know itrsquos fastened securely weight 67kg product dimensions 64 x 42 x 21 cm