The Whistler Pet Barrier is designed to safely keep your pets from going from the cargo area to the drivers and passengers seat, creating a more comfortable and safer haven for the driver, passengers and pets alike. Constructed out of heavy duty material, this adjustable pet barrier fits in most SUV, vans & wagons by attaching to the headrest easily without any tool necessary. This barrier does not work in a Volkswagen Tiguan, Subaru Forester, Toyota 4runner 2018 model & VOLVO CAR models that do not have vertically adjustable Head Rests.