Thin removable beverage coaster for insertion over the top of a stemware foot to absorb and minimize condensation

A coaster for cradling the stem of a glass, the coaster comprising:

• a substantially planar, absorbent, and portable body with a substantially flat top surface, a substantially flat bottom surface, and an external side edge;
• the coaster further comprising a centralized cavity with an internal side edge;
• a substantially diagonal radial channel extending from a first opening on the external side edge to a second opening the internal side edge into the centralized cavity;
• at least one substantially straight radial perforated channel extending from the internal side edge of the centralized cavity to a position on the body of the coaster between the external side edge and the internal side edge of the centralized cavity;
• wherein the centralized cavity is configured to removably receive and hold a stem of a stemware glass through the diagonal radial channel, such that the bottom surface of the coaster rests on a top surface of a foot of the stemware glass and the internal side edge of the centralized cavity surrounds the stem;
• wherein the straight radial perforated channel expands to permit that body of the coaster to sit substantially flat on the top surface of the foot of the stemware glass.