Of course! Halo bottles are vacuum-insulated, so they are designed to keep drinks cold for up to 24 hours and hot for up to 12. For optimally cold drinks, we recommend filling your Halo with ice cubes and adding very cold (pre-refrigerated) liquids for the best results.For optimally hot drinks, we recommend pre-filling your Halo with boiling water for 60 seconds in order to heat the inside layer, before emptying and then immediately filling with your hot drink.Always remember to ensure lid seal integrity, please make sure the lid is straightly aligned before tightening and not to overfill (leave a small gap). Do not vigorously shake with liquids inside as this may cause pressure and damage to the lid seal.