High-quality, stylish stainless steel flask with unique double-walled vacuum technology for optimum insulation. Keeps your drinks hot for 12 hours and cold for up to 24 hours. Durable and lightweight, it can take a beating and still provide you with an ice-cold drink. Slim design fits most vehicle bottle cup holders. Stainless steel inner allows for easy cleaning. Perfect for your gym bag, car, bicycle, and backpack to enjoy your long hikes, trekking, hot yoga class, long road trip, or any other outdoor activities. Five-year guarantee.