NEVER COMPROMISE FLAVOR: The ceramic interior will never impact the taste of your beverage and will never rust. VERSATILE ON-THE-GO MUG: The wide opening of the mug can be filled with ice cubes or snack food you want to insulate. COMPACT, YET EFFICIENT: The double-wall, vacuum-insulated, slim, compact mug easily travels with you and will keep your beverage hot or cold for hours. STAINLESS STEEL EXTERIOR: Stays cool to the touch with hot liquids and never sweats with cold liquids. ECOLOGICALLY-FRIENDLY: Take this everywhere and refill as needed to help reduce waste and one-time use containers.