Tumbler is defined by angles that create a great tactile and visual experience. Double-wall vacuum construction with copper insulation. Keeps drinks hot for 8 hours and cold for 24 hours. The construction also prevents condensation on the outside of tumbler. Compact design fits easily under most single cup or K-cup coffee makes as well as in all standard cup holders. Easy sipping, push-on lid with slide closure. Wide opening for comfortable filling and pouring.