If you want the protection of a vinyl or membrane mattress cover but also want it to feel nice under your sheets, then our stretch knit dust mite & bed bug covers are your best choice. They have a thin urethane membrane on the underside of the cover to block 100% of dust mites and their allergens, stop bed bug bites and provide waterproof protection. They also offer an easy to use secure zipper seal to keep bed bugs from entering or escaping. What separates these covers apart from other membrane covers is the polyester stretch knit fabric that feels like jersey cotton. This offers a nice surface to sleep on that is quiet without the feel of plastic under your sheets. The stretch fabric also makes it slightly easier to put on your mattress and reduces the fear of ripping as you pull and tug them into place. (If you have never put a cover on your mattress before, I should warn you it is not a single person job, especially with large, heavy mattresses). These covers are durable, protected by a lifetime warranty and will withstand multiple washings without reducing their efficiency to block dust mites and allergens. These are our top pick for an affordable dust mite or bed bug mattress cover that offers sleeping comfort and excellent protection year after year. They would also be an ideal choice for young children or incontinence thanks to their waterproof protection and washability without reduced efficiency.