IT NEVER FAILS. At least once a day someone stops me in a parking lot or yells out their car window at a stop light and asks "hey, where did you get the window bars?" The Pet Dog, Kid Car Window Guard! is an essential for warm weather safety, security, and comfort. The "accordion" design expands and contracts to fit any car window, front or back seat, and are great for keeping human kids in the car too! We recommend you get two, one for each side of the car---that works best for us. $10.00 each