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 of the 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 load trip, or any other outdoor activities. Five year guarantee.