Patented AUTOSEAL lid is 100% leak-proof and spill-resistant; AUTOSEAL button slides to lock, preventing accidental opening of the mug when not in use;Easy, one-handed use with no caps to remove or spouts to open;Double-Wall vacuum-insulated stainless steel keeps beverages hot for 4 hours or cold for 12 hours;Easy, comfortable handle designed for both left- and right-handed users;Fits most single-serve coffee brewers and standard car cup holders; Made from 100% FDA-approved materials