Used in every product Hydro Flask makes, TempShield™ is our double wall, vacuum insulated technology that guards the temperature of your drink. Bring ice water with you in the morning, and promise you’ll still have ice in the afternoon. Hectic morning getting in the way of your coffee sipping? No problem. It'll keep it hot until you’re ready. They also guarantee no condensation or heat transfer to the outside of the bottle, ever.