Pierre Olivier Brut Vin Mousseux NV is made from 100% Airen. A value sparkling brut, made with Airen grapes from around the FrenchSpanish border (next to the Pyrenees). This is a new Kysela Project. The bubbles are obtained using the Charmat method, named after Eugene Charmat, where the second fermentation takes places in a large, closed pressurized tank. It is different from the Methode Champanoise as the secondary fermentation doesn't take place in the bottle.