【THERMOS Vacuum Insulated Bottle】 Make your daily hydration more comfortable! THERMOS water bottles use high-quality stainless steel and a vacuum-insulated structure to keep cold drinks cold for 24 hours and hot drinks hot for 12 hours. They are lightweight and easy to carry, making them perfect for commuting, going to school, and outdoor activities. In addition, the drinking spout can be opened and closed with one hand and is designed to be leak-proof for peace of mind. With their stylish design, you'll want to carry one with you every day.