Polar Camel 20oz Stainless Steel Travel Mugs feature doubl-wall, vacuum insulation with a clear, slider lid. They are 2X heat and cold resistant compared to other tumblers. Polar Camels are made from 18/8 gaugestainless steel (18% chromium/8% nickel) also known as type 304 Food Grade. A percentage of sales from this drinkware will be donated to Winnebago Waterways to support efforts for clean water. 7 7/8" H x 3 1/4" Diameter