Booster Step is very durable and works great when attached to the Mini and Large Booster Bath. Booster Step also works fantastic with your car door threshold, SUV bumper, couch and bed. Booster Step weighs only 4? pounds however with its multiple rib system can easily support 150 lbs. The no-slip rubberized step mats insure your dog maintains secure footing. In addition there are four large rubber bumpers located on each corner that insure Booster Step stays in place when your dog enters, or exits.