These are great, use my set all time. I have a wood dining/great room table that’s now serving as home office, dinner table and school. You can imagine the glasses and “rings” that are all over the table. Not only that, to avoid glass to wood contact, the habit became placing glass on paper and then they all got water logged (almost as bad as wood rings). With these glasses, we don’t have to worry about the glass sweat getting all over everything. Highly recommend—one less thing to worry about (and constantly reminding kids or nudging guests to use a coaster). This is a great idea, hard to believe something like this just came out, how long hv we been using glasses!?