Siege well designed with ample settings Isofix mountings. This is the 2nd of this German brand known for the high level of safety of its products (see the tests and rankings on consumer sites). Moreover, these products Cybex hardly contain harmful substances that are recognized for many endocrine disruptors. So this is all good for our kids who spend hours nose and skin on these fabrics! For information, the X-Fix model 2 includes 2 energy absorbers on each side of seat useful in a side impact. Disadvantage: this model is wider than 10 to 15 cm as the X-Fix, which can be annoying when you have to install 2 or 3 seats on a bench ...