The Zojirushi 0.48L Stainless Mug keeps beverages hot or cold for hours with its high quality vacuum. It incorporates a tight fitted, flip-open lid for drinking convenience. The handy safety lock prevents the lid opening accidentally. The 2-step lid release process minimizes the amount of dew spattering from the lid. Its wide mouth accommodates full size ice cubes and makes it easy to drink from. The compact design takes minimal space while maximizing capacity. It is composed of BPA-free plastic and stainless steel and the nonstick coated interior makes cleaning a breeze.