Once you've fitted this Mamas & Papas Surefix base in your car, you can simply click your Primo Viaggio (sold separately) on and off for car journeys.You can adjust the angle of the base to ensure a good fit with your car and it has non-slip feet for peace of mind. You'll know you've fitted it correctly by looking at the bubble on the built-in 'spirit level'. It's so useful and definitely takes the guesswork out of in-car safety.