The RTIC Essential Pint Tumbler comes with a ceramic-lined upgrade. Each tumbler is constructed with durable double-wall vacuum insulated stainless steel that will keep your drinks cold for 24 hours and hot for 6. Enjoy true taste and no flavor transfer between drinks with the ceramic-lined interior. When pouring your favorite brew or mixing up a cocktail, do not use metal or hard plastic straws or utensils as scraping to the ceramic-lining can occur. The splash-resistant lid will keep every drop inside and the sweat-free exterior is free of condensation.