As another reviewer noted, it was perfect for my Sleep Number bed.  I have the adjustable bed which doesn't include a box spring, just a platform.  The mattresses are not removable, so a traditional bed skirt will not work.  This was easy to put on, and it looks great.  I have a king sized bed, and the queen/king size bed skirt fits perfectly.  I threw it in the dryer out of the package and that took care of the wrinkles.  I definitely recommend this product!