Stainless steel polar camel insulated tea or coffee mugs feature double-wall, vacuum insulation with a clear, slider lid. Laser engraved with the Retreat & Refresh Stroke Camp logo. They are 2X heat and cold resistant compared to other tumbelers. Polar Camels are made from 18/8 gauge stainless steel (18% chrominum/8% nickel)-also known as Type 304 Food Grade. When compared to the Yeti Tumbler, a similar-sized Polar camel will hold ice equally as long. Both hold ice for hours and also keep drinks hot for hours.