Domaine du Collier works the clay topsoil in Saumur specifically to push roots down into the calcium-rich tuffeaux beneath. The limestone signature here isn't decoration, it's the whole point. Fermented on native yeasts in barrel, then two to three years aging on its lees without racking in a frigid underground cellar, split between barrels and Stockinger foudres. The result is Cabernet Franc with chalky minerality running straight through the mid-palate and tannin that's fine rather than green. Patience, not extraction.