This dog back seat extender creates a rear-seat car bed and cover for car, Suv or truck travel. The listed support capacity is 350 lb. The cushion and bottom area measure 54 x 25.6 in, with overall product dimensions of 83.9 x 67.0 in. The base uses 600D Oxford cloth with Pp honeycomb board and a 7-layer bottom structure. One mesh panel supports airflow and visibility, and two storage pockets hold small travel items.