The Special Tomato is FMVS213 compliant - meets all requirements for car seats designed for children weighing up to 150 lbs - Simply use the included LATCH System to properly anchor the Special Tomato as a car seat for kinds up to 50 lbs - If your vehicle does not have LATCH System or for children weighing from 50 lbsto 150 lbs - Vehicle lap/shoulder belt must be used - The tether system must be installed at all times when using your Special Tomato MPS as a car seat - The Special Tomato is also designed for use with standard tie-down systems for bus or van transport and meets ANSI/RESNA WC/19 safety regulations - Special Tomato MPS seats purchased before 10/2003 dates are not suitable for use as a car seat.