PREMIUM STAINLESS STEEL TUMBLER: made of 18/8 stainless steel, which provides with double-wall vacuum insulation to preserve the temperature of the drinks poured into it. The lightweight insulated cup can keep 20 ounces of coffee or tea and retain their warm temperature for hours, also works great for your favorite icy cold beer, juice or cocktail. nice temperature retention, great quality and modern design make it a must-have accessory of every family, perfect for outdoor parties or just for cozy nights at home.