Double wall vacuum insulation, interior stainless steel 304, stainless steel 201 exterior, fits most cup holder make drinks stay cold, iced or hot for hours. A rotating cover with three positions: a straw opening designed to resist splashes with a seal that holds the reusable straw in place; a drink opening; a full-cover top for added leak resistance. With an ergonomic, comfort-grip handle, so you can easily carry your ice-cold water to work, meetings, the gym or trips.