The ZIZ thermal cup preserves the beverage temperature so that you can enjoy your drink longer. The travel mug is made of stainless steel (interior) with plastic casing (exterior) and is sealed with the plastic/rubber lid that prevents leaks and spillings. The mug's bottom overlay prevents it from sliding. The unique design with the Sleep Is for the Weak artwork will lift your spirits. This insulated thermal mug can hold up to 380 ml of your favorite drink. After 2 hours, hot drinks cool from 95 ° to 47 °C, while cold drinks warm from 7 ° to 15 °C. Warm and cool temperatures keep even longer! The cup feels pleasantly cool/warm to the touch even if you fill it with the coldest/hottest drink. Dimensions (L x W x H): 70 x 70 x 190 mm. Diameter at the bottom: 60 mm. How to use ZIZ thermal cups: do not fill it to the brim. After filling it with boiling water, let the steam out to remove excess pressure by opening a valve on the lid. Do not turn a sealed mug filled with hot water upside down. Tighten the lid by easily turning it clockwise. Do not wash in the dishwasher and do not throw. This way, your mug will serve you for a long time, keeping your drinks warm or cold – whatever you prefer.