Double wall technology make it excellent in temperature protection. You could enjoy your beverage cold or hot. So as to maintain its thermal insulation, hand wash recommended. Please note the rush power of the dishwasher might affect the lifetime of the vacuum insulation. Insulated tumbler is made of stainless steel with a superior non fading coated finish. BPA Free, Lead Free, durable, unbreakable. Designed for car cup holders, bring your favorite drink to go and enjoy moments of bliss.