They don't slide. Perfect size. Love the design and best of all it catches all the condensation! PerfectI got the wrong color that I ordered but I still like itI wanted durable outdoor coasters and these fit the bill. I will say that it collects the condensation from the glass but if you move the coaster the water runs onto the table, floor or wherever. This isn’t a big issue for me.Previous purchases of similar, silicone coasters was a super-positive experience. The ones I've use previously were semi-rigid. That meant that after cleaning them, they would stand up vertically and dry evenly within a few hours. These coasters are floppy. Which means they do not easily stand upright on their own. Stacking them when they're wet is just asking for mold/mildew problems. I wish they were more rigid so that they would properly dry overnight. That said, what I do appreciate about these coasters is that they have a design on both sides--so I can flip them when the vicar comes in for a pint! ;) But in all seriousness, when I purchased this pack I also purchased coasters from anohter company. When those arrived, they were only "printed" on one side, which made drying them even more difficult!These coasters are great for the money. Just be sure to dry them well before stacking or placing on your tabletop.A decent looking set of coasters. As mentioned, they are not thick but they keep our glass topped tables dry and hold glasses well.I love that these are flat but will hold water if your glass sweats and since they are flat your glass won’t tilt when removing and they just wipe clean when neededI really enjoy these coaster. Some of the sigils don't seem to mean anything, unless it is private to their maker. Still, they are an excellent addition to my living room.East coasters have no absorbency and they are very, very flimsy.These are brilliantLightweight , durable and look fantasticReasonable price tooNeat, tidy design, flexible and waterproof. Provides great protection for glass top garden furnitureFantastic and very cool toHeat penetrated the coaster and produced ring marks on new furniture.We are using these coasters on our quartz countertops. They look great and silence the noise of the glasses.