Hi KBr00ks.
Welcome to our Mattress Forum!! 
I am glad to hear that your 8 yeas old latex mattress serves you well and that you are still happy with your purchase.
At a first glance St. Dormier wool mattress protector is offered by some our trusted Members such as Flowbedshere or Memory Foam Comfort here.as their top pick protector. St. Dormeir (produced by a Canadian company) is one of the best water resistant mattress protectors, that doesn’t take away from the feel of the bed and still allows for the latex to breathe. The protector is washable and comes in two skirt sizes. (16" and 24") The jersey knit cotton would allow more airflow and the wool in St. Dormeir would likely contribute to the temperature regulating that you are looking for. If you are inclined to do some more research to cover all your basis, there is more about the pros and cons of different types of mattress protectors in post #89 here.
The Woolroom is a British company that carries bedding accessories. Their mattress protectors are made of cotton quilted with 250 gsm layer of carded wool. They have not been discussed previously on our forum… so hopefully, someone that used their mattress protectors will see this post and share their experience.
Phoenix