Finum's Hot Glass System is the classic solution for everyone who wants to keep fingers cool while keeping tea hot. The double wall insulates hot and cold beverages alike. The permanent filter is taste and odor-free stainless-steel micro-mesh. The lid prevents heat-loss and retains the aroma. Turned upside down, the lid doubles as a handy drip-off tray for the brewing basket. The set is completely dishwasher safe. It's handmade, so each glass shows individual nuances in thickness, height and weight.