These Comfort Foam 4 Step Pet Stairs are well worth buying... the foam is very sturdy and good quality... and the fabric cover that zippers over the foam pieces is very good quality! They are perfect and just what I was looking for.. for my two cats which are older adult cats..they  easily adjusted to the stairs and are very easy for them and are soft enough but sturdy enough for them
to climb up and get down..I am very pleased with this purchase!!! Great 
buy... I would recommend to anyone with cats or smaller to medium sized dogs!