The Guardian Travel Tumbler is built with Thermos vacuum insulation to keep drinks hot for 3 hours or cold for 10, while the durable stainless steel interior and exterior makes it perfect for daily use. With a leak-resistant plunger lid system and easy-to-use slide lock lid, this tumbler is convenient and stylish. Plus, it fits most vehicle cup holders. Backed by a 5-year guarantee, this tumbler is a must-have for any busy lifestyle.