Doona ISOFIX BaseThe Doona + Isofix base from Simple Parenting has been designed especially for the Doona + car seat. It is installed into your car using the ISOFIX anchor points to re assure you that the seat is secured correctly without the need to additionally secure it in place with a seatbelt. The Isofix base has been engineered with safety and simplicity at the forefront of the design, simply click the Doona + car seat into position.