In response to increasing demand for the safety and reassurance the Britax Boulevard CS provides, Britax Child Safety Inc. will release the Marathon CS convertible child safety seat in June. The Marathon CS combines the Click & Safe Snug Harness Indicator with the safety, comfort and ease-of-use features that led the original Marathon to become a favorite of caregivers. The Click & Safe provides a solution to the leading misuse of child safety seats – dangerously loose harness straps – by giving an audible affirmation when the harness straps are within the proper range of snugness.
Baby Gizmo Blogs, a 
Great Information provided here about Britax Boulevard CS as my son is one year old and i need to get this one for my son. Thanks for the info !!!