Car Window Vent/guard: Allows ventilation & creates air flow yet stops pets sticking their head out of the window. Expands to fit most car windows: Pet car vent easily expands and contracts to fit different width windows and configuration. Slits in the top and bottom of the car vent securely install the vent to prevent slippage. No tools required. High quality: Made of sturdy polypropylene with the finest quality for long lifespan. Easy Foldable Storage:Folds flat and compact for easy storage. Easily fits into compartments or small storage areas. Note: cars become unbearably hot when parked even with windows left open. Never leave pets unsupervised in hot cars. Note: engage the child window lock when guard is fitted if available.