Sturdy foam with soft microsuede cover and removable plush pillow; machine washable;Tether can be attached to pets harness to keep them comfortable and secure; accomodates up to two small pets;Booster is easily attached to car seat;No assembly required;Booster seat measures 22L x 17W x 11.5H; Interior dimensions 17.75L x 12.5W x 4H; for pets up to 25 lbs