Okay -- not just mug rugs but coasters. I notice they're really the thing here but I have a question. We have good wood furniture. The idea of putting batting and 2 pieces of cloth on the table to protect them from a sweaty glass ---well, it breaks ME out in a sweat!!! If the sweat works thru the 3 layers, it'll ruin the tables!!! Do you just use them on glass tables?