Hi latexintheatx,
Welcome to the Mattress Forum! 
and congratulation on your brand new bed :lol:
All foams will need protection from the mechanical abrasive forces, outside added materials (body oils, skin cells, fluids, etc.) as well as protection from UV rays and oxidation. Most foams will already have anti-oxidants blended into them, but you’ll still want to use a good covering, whether the product be latex, polyfoam, or memory foam.
There are a myriad of mattress encasements available, with the most flexible generally being some sort of a cotton/polyester/viscose blended with something like elastin. These will interfere less with the point elasticity of your very soft latex later.
At a quick glance some of the site members offering more flexible mattress encasements would be:
Latex Mattress Factory (member of this site) has a removable and washable 360-degree zipper cotton cover from 2" to 12" in thickness.
Midwest Mattress has a protection encasement with a zipper that does not change the feel of the mattress.
There are some other the protector and cover options mentioned in the component post here, but not all are site members.
Mattress encasements can be one of the most significant parts of the cost of a mattress and also one of the most important. Not only can they have a major influence on how a mattress performs and feels … cheap or thin mattress covers will not properly protect the foam inside and in particular with latex can allow the foam to degrade and break down much more quickly and significantly lower its longevity.
I hope this helps.