THIS IS A HEADREST MOUNTED PET BARRIER & REQUIRES ADJUSTABLE HEADREST STEMS TO MOUNT. Patented Design.No bars,grills,or nets to impede your rear vision. You will forget you have it! Fits virtually any Hatchback Car,Compact SUV,Crossover,Compact SUV. Safe & Flexible. Reduces effects of hard stop. Bite Free (no bars for pet to chew).No horizontal bars to catch pets collar Height can be adjusted to fit dimension of vehicle roof & allows to fine tune distance from rear seat, in order to match seats recline angle. WalkyAir is the first fully transparent dog car barrier. It's compact design structure is made of the same PolyCarbonate material used in the automotive industry. It is designed to offer the best visibility; it is impact resistant & it fits almost every hatchback model. WalkyAir can be set up very easily & NO TOOLS are needed for assembly. You can move this guard barrier from car to car easily.