Whether abstaining with water, savouring a summer’s evening with a Beaujolais or Pinot Grigio, or kicking back with a cocktail, the cooling coaster keeps your choice of beverage chilled. Used coaster, the pointy-footed glass rolls gently around, the better to coax those complex whisky aromas out.For best cooling results, chill the coaster in the freezer, and your preferred beverage in the refrigerator, for an hour prior to use. The chilled coaster should then keep your drink sufficiently cooled for about 2 hours. If a dropped or damaged coaster leaks coolant, the liquid is water and poses little risk.