"Natural is what the wines emphatically are. “Natural” is a notoriously difficult category to define, and a contested one, but there are very few wine ranges in South Africa that meet the more rigorous standards, which would include hands-off, additive-free winemaking (not uncommon these days, especially in the Swartland) but also organic viticulture (that’s the really tricky bit). As to truly minimal sulphur content, that’s even rarer (and the most contested of the requirements). These wines, however, meet all of those standards."
Tim James, South African Wine Writer