Safety - for dogs who ride in the front seat, the Front Seat Extender expands the size of the front seat and helps prevent your dog from falling into the footwell. Comfort - provides a larger more comfortable front seat ride for your dog. Perfect for large breeds - many larger breed dogs simply won't fit on the front seat. Reduce falls in the footwell - increases safety by reducing the risk that your dog will fall into the footwell through quick turns. Cars and SUVs - sized to fit the front seat footwell under the dash in most cars and SUVs. Microfiber - uses durable heavy duty commercial upholstery grade Microfiber fabric, solid high-density foam and a waterproof breathable liner. Waterproof - the foam is encased in a waterproof /breathable liner preventing water, spills, accidents and smells from seeping into the foam. Cover and liner zips off for easy washing and drying. One extender is needed – one extender is needed to fill the passenger footwell (don't use the extender on the driver's side footwell : ) . Machine wash and dry cover and liner on cool gentle settings. Don't dry clean or use stain removing solvents. Easily supports up to 125 lbs. 15” L x 12” D x (13” H and 9” H creating a better fit under the dash fit). For Pet use only. It's not a good idea for your dog to rise in the front seat. But, sometimes they just have to.