The double-walled Hot ‘n Cool tumblers by Jenaer Glas are ideal for serving drinks in a contemporary fashion—both in winter and summer! The special construction of the insulated glass makes the content look like it is floating. The simple design of the Jenaer Glas Hot ‘n Cool tumblers is suitable for all occasions, adding a touch of elegance and functionality to your beverage service while keeping drinks at the perfect temperature.