Vin de Voile indicates that the wine has been aged under a thin 'veil' (or voile) of flor that has naturally formed on the surface, using Mauzac Roux grapes high in both sugar and acidity. This wine style has been a specialty in the Gaillac region for centuries.The method will be familiar to Vin Jaune drinkers out there.
Naturally fermented in very old demi-muid barrels, a thin veil of flor begins to develop on the surface of the wine. Once fully formed, the voile 'protects' the wine from overt oxidation while it ages sans ouillage (without being topped up), for a further seven years. During that time, the wine gains in depth and complexity and loses about 20-30% of its original volume.
Gaillac's Vin de Voile doesn't have the same level of acidity as their Jura counterparts and offers a wine with quite a different personality. In the case of the Plageoles' example, you can expect a perfume of grilled nuts, smoke, and iodine-like notes leading to a layered texture in the mouth with similar characters along with dried fruit notes, plenty of salty tang and an amazing length of flavour.