I've had an Ecoyoga natural rubber/jute mate for a fair while, and liked it a lot.

They do tend to shed tiny particles of rubber, and I managed to destroy my first one by getting stuck in hospital for several months and leaving the mat where it would be in concentrated sunlight every day, which made it go funny.

But I liked it enough to buy a duplicate as a replacement: the texture's lovely, and I find it great to use. There is a strong "latex" smell when you first unwrap it, but that fades very rapidly; I can't smell it at all now.