I guess I spent way too much time doing online shopping this Christmas season because I did not even realize that they were made out of glass until they arrived at my home. I was pleasantly surprised at how beautiful the mugs are and how nice they feel to hold and touch. Definitely an upgrade from our ceramic mugs. I am in love with them! They keep my milk nice and cold and bubbies hot cocoa nice and hot. [This review was collected as part of a promotion.]