I really like this item.  I bought for the KING and the DOUBLE and the TWIN beds.  I'm now going to purchase for the QUEEN.  I like how it covers the entire mattress and that it zips up all around.  I was worried the KING would not fit as mine is very high but it did!   The waterproof works well as I can just wipe it down with lysol and a cloth and it's just great!  My son's sneezing at bedtime has gone away as he has dust mite allergies.  I normally do not recommend much of anything, but this one, I highly recommend!