This tumbler features a double-wall stainless steel base that’s available in a variety of popular colors and is slightly tapered to fit in most car cup holders. It has a clear plastic snap-on, spill-resistant lid with a slide-top sipping area. Vacuum insulation keeps drinks hot or cold for up to 6 hours. Customize with a 1-color silkscreen imprint. CA Prop 65 compliant. BPA free. Meets FDA requirements.