Our Mugs are a thick glass. They hold 26.5 ounces of your favorite beverage. Great for Root Beer Floats for the younger ones and a great frosty beer mug for the adults. Just run it under water and tip it upside down in the freezer. A great gift for the sports fan in your life. Put their favorite team on one side and their name on the other. Also great gifts for that hard to buy coach Put your team logo on it.