This mug features a groundbreaking advancement in thermal insulation. We used an integrated molded Polyurethane sleeve that insulates the liquid inside the mug, unlike double-walled mugs which only protect your hands but don't keep your beverages hot or cold. Excess liquid flows back into the sipping hole because of the concave design of the lid.
Ultra-durable food grade Nylon 66 is dishwasher safe
Hard wearing, stain resistant
Will withstand high heat and cold, won't crack
Patent-pending Protex™ hex pattern base
Please note that Delta products should not be used in a microwave.