Pretty Big.  Look at the dimensions and your tub before ordering.
Beware.  This is pretty big and if your bathtub curves in at all it's not going to stick.  Frankly, i haven't seen a totally square bathtub in my life.  So we don't use it and I feel bad because it's just another thing for the landfill. I had another one too - the shell shaped one and that didn't stick either.  But we did finally get a neck roll one that works very nicely.
Rating: 1 stars