Concrete is cool. Coasters are just good manners. Combining the two is obvious, but this particular coaster goes one step further because the cement has enough non-toxic recycled ash in it to make the coaster water absorbent. Most coasters prevent your cold one from leaving a ring (that’s kind of the point), but this one will actually help counteract the fallout from overzealous pours and accidental cup jostles. It’s also happens to be heavy enough that it won’t stick to your glass. This isn’t rocket science, but it’s pretty close.