Hi udoknowjac,
Based on their website it appears that Sleep Warehouse sells Bamboo covers and there are also some other sources in the component post here (but you would need to check their websites or call them to make sure they sell topper covers that would fit your topper and not just mattress covers).
I’m also a little confused about why you are confused and we may be getting lost in different terminology. Sometimes the same word is used to describe different things. My reply in post #6 here covered most of this but I’ll add a few comments here.
A mattress cover is the cover that is around your mattress and is part of the mattress itself. The top part of your mattress cover would be the fabric that your topper is sitting on so if you are using a topper then your mattress cover would be under the topper and further away from your body than the topper (and would have little effect on temperature). A topper cover would perform the same function as a mattress cover except it would enclose the topper and would be closer to your body than the mattress cover. A mattress protector is a product that is used over a mattress (or over a mattress/topper combination) that is used to keep your sleeping surface in a clean and hygienic condition and protect your mattress or the topper (including any cover around either one) from being stained from body fluids or accidents. It would be right underneath your sheets so it can have a more significant effect on sleeping temperature along with your sheets which is what you sleep on directly and are in the closest contact to your skin. Your Tempurpedic already has a mattress cover (the fabric around the mattress) so you don’t need another one.
The products we are discussing are 1.) a cover for your topper and 2.) a mattress protector and 3.) your sheets which are the materials that would be closest to your body. If you are using a topper with a cover and also a protector then from the top down (listed layer by layer and excluding your pyjamas or what you wear to bed which can also have an effect) you would be sleeping on your sheets, then your protector, then the top surface of the topper cover, then the topper material (memory foam) itself, then the bottom surface of the topper cover (which would have little effect because it’s under the topper memory foam material), then the mattress cover (which would also have little effect on sleeping temperature), and then the top layers of memory foam in your mattress (which may have some effect because they would affect the heat that is stored in your mattress and would also have some effect on how deeply you sink into the mattress and how insulating it is).
I’m not sure what you are referring to when you mentioned a “quilted cover” because the Symphony mattress had a smooth cover (you can see a picture here). Can you clarify what you are referring to and whether this is the cover that is part of the mattress itself? It’s possible that you have the Celebrity Bed or the Grandbed because both of them had a quilted cover around the mattress. Either way though … it wouldn’t make much difference if you are talking about the original cover around the mattress and not an additional component that we haven’t included in our discussions.
The “best” option would be the one that works best for you based on your actual sleeping experience and with a memory foam mattress there is no way for me to know for certain whether any option or combination of options will be “enough” for you in terms of temperature regulation. If you use a topper cover that is more breathable and moisture wicking and a mattress protector on top of that which is also more temperature regulating (such as one of the wool/cotton choices like the St Dormier mentioned in the mattress protector post here) and then you are using sheets that can also help with temperature regulation then that would be about the best you could do within the limitations of your memory foam mattress and topper unless you were considering much thicker options that would have a much bigger effect on the feel and performance of your sleeping system.
Phoenix