The Big Green Sucker is a perfect 40cm x 70cm in size with a huge surface area for water to reside in, but also a large contact area as you run over your car. As it's so absorbant, you can pretty much do a whole regular sized car without wringing it out. I can tell you that these attributes make drying a hell of a lot quicker!! Its final size came from much trial and error, as we found there is such a thing as having too much towel. With this final size not being too difficult to handle around the car.