Based on our adaptogenic Beta Bar in Montreal, this travel tumbler is meant to hold all of your beverages, to-go or at home. The tumbler is made out of stainless steel. It keeps drinks hot (65℃/149℉) for 6 hours and keeps drinks cold (8℃/46℉) for 6 hours. For maximum insulation efficiency, preheat or pre cool the tumbler prior to use by filling in a bit of hot/cold water for 1-2 mins. The tumbler includes two sipping lids which allows for no spillage.