With its double wall vacuum insulated design, this portable insulated water bottle combines form and function to provide a useful drinking option for both winter and summer. Drinks can be kept hot or cold for up to eight hours. The stainless steel straw-cap water bottle ensures a tight seal and stops water leaks. The twist-on cap on each thermal bottle is easy to open and entirely leak-proof. Whatever the liquid's temperature, this bottle won't perspire or heat up. Narrow mouth and tight cover of the sports bottle make it simple to store spill-free in your car seat or camping gear.