https://yawnder.com/product/2-5-inch-activedough-mattress-topper-cbd-oil/

this is the topper I have. It did not come with a cover, so I got a this encasement to cover the topper (https://www.amazon.com/gp/product/B082MGNX77/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). I literally went overboard. I took my old mattress protector, and covered my box springs with it. Covered the topper, Covered the mattress with the BB 5 side wp cover, then covered all of it with the sleep zone (https://www.amazon.com/gp/product/B08ZJ7FDZT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) it fits so tight and snug that it doesnt allow the topper or anything to slide around and stays in place. All in all it works perfectly for me. Everything is protected.