The Wine Freeze is perfect for all wines. Just pop it in the fridge to cool your reds to the perfect cellar temperature or store in the freezer to chill your whites. HOST's proprietary cooling gel is precisely engineered to keep your beverage perfectly cold for hours. Inside the BPA free plastic walls of the HOST Wine Freeze Cooling Cups lies our proprietary cooling gel. This gel was precisely engineered in house to provide the perfect temperature for white and red wines for hours Each glass is constructed with an insulated silicone band for comfortable handling. Each glass can comfortably accommodate 8.5 ounces / 240ml Hand wash only For the best results, place the Wine Freeze upside down in the freezer to allow the gel to evenly spread and freeze.