The Thermos Element 5 Travel Mug features TherMax double wall vacuum insulation for maximum temperature retention, hot or cold. Keeps hot 6 hours, cold 8 hours. Light and compact design featuring unbreakable, precision 18/8 stainless steel interior and exterior. Leak-proof 360 degree drink lid is easy to use and drinkable from any direction. Comfortable rubberized stainless steel handle with carabiner for space saving and instantly accessible attachment to backpacks and other gear. Rubberized shock absorbing base with wide stance for stable footing. Designed for maximum temperature retention and built to be 100% leak-proof. Capacity: 16 oz