Perfect cup
"The design of this cup is perfect Double wall construction keeps the outside cool wile maintaining the fluid temperature due to its excellent conductive heat barrier. The shape adds to the thermal insulation by constricting slightly at the top decreasing evaporative and convection loss. Comfortable and easy to hold. The cup tolerates being on a warmer plate if you are sipping rather than drinking. Of course, can't be reheated in a microwave."