Answer This support leg serves several functions. The support leg prevents the car seat from rotating (tipping) in the event of an accident. If the support leg is not used, the car seat may be pushed so far into the seat of the car during a front-end collision that the child will be thrown forward and may even hit the front seat or dashboard. The support leg is equipped with an indicator that shows whether the installation is correct. All IsoFix products from Maxi-Cosi have indicators so that you can immediately see whether the car seat has been installed correctly. The indicators are located on the steel IsoFix anchor points and the support leg: a green colour appears if the support leg is adjusted properly. The IsoFix products from Maxi-Cosi rank among the very best and safest car seats on the market. The Maxi-Cosi CabrioFix with EasyFix base has received the highest possible rating of five stars. Your child is guaranteed optimal safety with our IsoFix products.