Hi Jill71rdh.
Congratulations on your new mattress purchase! :cheer:
I am glad you are narrowed down your search and decided on a product from Arizona Premium. As you already know they are one of the manufacturing Trusted Members of this site and like all the members here I think very highly of and consider them to compete well with “the best” in the industry.
I agree with you that It’s always wise to use a mattress protector on any mattress to protect your investment against stains and accidental spills (which can void a mattress warranty) or from the normal body fluids and oils that we release each night along with the skin particles. Having a protector that can easily be removed and washed will help keep your sleeping surface in a clean and hygienic condition. There are many protectors to choose from and you may wish to read through some of the popular types of mattress protector options as listed in post #89 here . There are some protectors that meet your general criteria that use wool (which is a more temperature regulating material) in their construction that may be of interest to you. One of the most popular of the cotton/wool protectors is the St Dormier protectors that you may wish to consider, but it is water resistant and not 100% waterproof. St Dormier has been recently discussed in post #24 here There is more about the pros and cons of different types of mattress protectors in post #89 I linked above. The stretch knit cotton protectors would likely allow more airflow but with the wool, the St Dormeir would likely be more temperature regulating than any protector.
I’m looking forward to your feedback when you’ve had the chance to sleep on your new mattress for a while.
Phoenix