Feature: 1.COMFORTABLE TO SLEEP Increase the space in the rear compartment for a more comfortable sleep, even for taller individuals. The product uses a high-strength composite anti-collapse material, not collapse, waterproof thickened fabric. 2.INCREASED SPACE Both sides of the screen design, you can place items to prevent cell phones, keys and other items fall down the gap. 3.VERSATILE Not only can it be used as a car rear compatible for seat extension board, providing better support for the mattress, but it can also be used as a pet mat(need to add your own mattress). Application: Car travel back compatible for seat mattress expansion is suitable for most vehicles, mainly compatible for Tesla model Y & model 3 Specification: [Product material]: Oxford Cloth, Sponge, Hollow Board, Non-slip Silicone [Product packaging]: Corrugated Paper Box [Product size]: Unfolded: 126*42*28cm Folded packaging: 42.5*33*10.5cm [Product weight]: Gross Weight 2.92kg Note: WARM REMINDER:Our backcompatible for seat extender isused to connect the front compatible for seat backrest to the backcompatible for seat cushion. It is suitable for use with mattresses, not for use in the back compatible for seat directly,especially for pets (you need to add your own mattresses).