This thermos is perfect for you to drink while on the road, but it won't be too long without a drink. It is a must have for afternoon hiking. This thermos is made of 18/8 food grade stainless steel both inside and outside, which enhances the requirement of vacuum the basis of ordinary thermos, so that it can keep cool and hot for a longer time. Ours thermos can be any kind of lid, it can be turned into a carry on wine cup, sports bottles, or even a large thermos bottle can meet the needs of a day's travel and keep warm or cold as before.FEATURES:Material: Food Grade 18/8 Stainless Steel ; SiliconeCapacity: Multiple size options18/8 FOOD DEGREE STEAL: No BPA, no chemicals.ROBUST BODY: It will resist the most common accidents.DOUBLE WALL STRUCTURE: It keeps the temperature you want for longer time even in very cold environments.Note:Please allow 1 3cm error due to manual measurement, please.Actual color may vary from the color on your screen due to monitorcolor restrictions.Do not put in the microwave or the freezer.Please note the rush power of the dishwasher might affect the lifetime of the vacuum insulation.Please use 100℃ hot water for preheating first, so that it can better serve you in the future.Never use abrasive cleaners containing chlorine.