Here is my take. I have been using latex (both Dunlop and Talalay) for years and I love it for toppers.
I have made my own protector, bought many zippered protectors from various latex sellers, bamboo, and wool/bamboo encasements from sleep like a bear (their wool/bamboo encasement is awesome, but I am not sure if it comes in 1 inch, still a 2 inch would work, but it is expensive. And you cannot wash it. Encasements are the best protection, but of course, the shallowest I can find is 6 inches. (the kind with polyurethane in it, not vinyl)
Now here is the thing about latex toppers for me, I am very sensitive to smells, and the smell of the latex starts to bother me. No matter how much you air it out, it still has that "Vanilla" smell. That smell then transfers onto your mattress pad, and mattress. I do not like that. So I went looking for a enclosure that would help reduce the smell factor. I found a linen manufacturer that takes individual on line orders, It is London Bridge Linens in Arizona.
www.londonbridgelinens.com
You have to order their custom encasement, and I usually order it 1 inch wider, and 1 inch longer, and 1 inch thicker than what I want, because it has to fit LOOSE so that the corners to not turn up on your topper. Otherwise it will not lay flat. They put the zipper on the long side and about 1/4 the way on the sides so you have a three sided opening. The top is terry and inside it is the polyurethane. If you then put a regular mattress pad on top you will have no problem with noise when you roll over.
It is expensive, but not as expensive as some. You can wash it (so you do need to order it larger than what you want, it does shrink just slight) Now you can just order it on line, but I find that I finally had to talk to someone directly about the measurements (after all you are going to pay for this, you should be able to make sure you get it perfect. I have about 4 of these, as I use them on my own, my husbands, guest bed, wherever I have latex toppers as part of the mattress make up) Anyway, if you just order it online and fill in the form (the smallest it has listed is 4 inch depth...so in the COMMENTS you have to type in the exact measurements you want (they can make them 1 inch or 2 inch, etc. I don't recommend the 1 inch, however, as I have tried it, and it was just too close..it is better to have it a little too big than too small, because then you cannot use it at all. IT IS NOT RETURNABLE because it is custom...so you got to get it right. Now if you just fill in the measurements, I have had mistakes with just filling in the measurements and sending it off, so I highly recommend that you TALK to a customer service person (I talk to "Emily" to get the measurements just right, explain how I am going to use it, and she will make sure it gets made with the exact measurements that you want. You do NOT want it to be a "SNUG" fit,
That curls the 1 inch topper (and the 2 inch too) because it is just too flexible). You will NOT notice any difference in performance if there are a few wrinkles in the cover because it is oversized, especially if you have a regular mattress pad on top of it. Just thought I would pass that information along. FYI