Utopia BeddingPremium Mattress Pad (Queen) - Micro Plush Ultra Soft and Overfilled Mattress Topper by

The descriptions states: for mattresses up to 18" deep which means it will be big on my 12". it also states it will not slide around. is this true?

Anyone washed this mattress pad? If so, how did it hold up?

Is it water proof?

How many come in one order?