The lightweight Delta Mug features an ergonomic rim for a easy sipping. The Nylon 66 material is doubled up along the top edge forming a hollow gap between the cup and the rim so fingers are protected from hot liquids. Also has our unique hex pattern base which reduces weight and is cool to touch. 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. BPA free. Assorted colors: Blue, Orange, Green, Grey.