The chicco oasys 1 isofix combines isofix connection with top tether fastening and the chicco double check fitting system to ensure safe and correct fitting the chicco oasys 1 isofix has a deep seat with high sides to protect your child in the event of a side impact the headrest and harness adjust simultaneously to 6 positions to accommodate your growing child and the chicco air circulation system means that the seat structure fabrics and all the oasys padding has perforations for maximum