How deep is the Purple™ Mattress Protector? The Purple™ Mattress Protector protects mattresses up to 15 inches tall! Related articles Does Purple™ Mattress Protector protect against bed bugs? Do the Purple adjustable bases work with any Purple mattress? Can you use the Purple™ Mattress Protector with any other mattress? Does the Purple® Mattress protect from liquid? What is the preferred base to use with the Purple® Mattress?