Safe & Secure: Convertible Car Seats Safe and Secure SafeCell Impact Protection - Convertible Car Seats An integrated system of safety components that work together to protect your child well beyond the federal safety standards. Learn More Energy Absorbing Foam Learn about how and why Britax uses Energy Absorbing Foam Learn More Tightening the Harness All Britax infant, convertible and harness-2-booster car seats have harnesses used to help keep a child safe and secure while sitting in a car seat. READ MORE About LATCH LATCH stands for Lower Anchors and Tethers for Children. LATCH is required on car seats and in most vehicles manufactured on or after Sept. 1, 2002, to make car seat installations easier. Learn More