DOUBLE WALL VACUUM INSULATION: Our stainless steel wine tumblers adopt the technology of double walled vacuum insulation that keep beverages hot or cold for hours and prevent sweating or condensation. So whether it's summer or winter, this double wall vacuum insulated wine tumbler will gives you a better drinking experience in daily life. PREMIUM MATERIAL: Made of 18/8 of 304 high-quality stainless steel, these insulated wine tumblers are light weight, lead free, unbreakable and easy to clean. MANY USAGES: This stemless wine tumblers with the capacity of 12 ounces could meet your needs for hot or cold beverages: coffee, water, wine, beer, champagne, tail, smoothie, beer, juice, milk, ice cream.