Hi Cattoo,
Congratulations on your new Quality Sleep Shop Simple Sleep mattress! :cheer: You certainly made a good quality/value choice. I’ll be interested to learn your opinion of your new mattress once you’ve had a chance to sleep upon it for a while.
A mattress protector is generally designed to take the place of the typical mattress pad and afford an extra layer of “protection” against body oils and other fluids, and these protectors most often have some sort of a waterproof membrane, such as a polyurethane film or PVC/vinyl/plastic.
A mattress encasements/cover, as most often referenced here on the forum, is some sort of a zippered structure that helps hold the foam layers in place in a component-style mattress, and it also helps protect those foams from outside elements. But a mattress pad or protector is often used over this encasement.
A mattress encasement can also refer to a specialized type of mattress pad or protector that zips up and “encases” the entire product, again taking the place of the traditional mattress pad.
I know. It can get confusing.
There is more about mattress protectors in post #89 here and the posts it links to (there are quite a few) and this post. There are also more sources for mattress covers in the component post here.
The double knit mattress cover you posted about is usually used to encase the actual foam material of a memory foam mattress. The cotton mattress cover could be used as a protective encasement, but you’d need to have it pre-shrunk. I would contact Foam Order by phone, as they are able to offer quite a few different things and may be able to customize something that specifically suits your needs.
Other than that, there are many options for zippered encasements of a mattress. You can check out some of the more knowledgeable outlets like Allergy Buyers Club (or their sister site Sleep Buyers Club) are often great resources because they personally test all of their products and have good comparative descriptions of the different materials on their site.
Phoenix