Come and Check Our Branding Solutions.The double wall insulation makes the Iron Flask Tumbler sweat-free!It keeps your drink COLD for up to 20 hours,and HOT for up to 5 hours (depending on size).Our tumblers fit in most standard cup holders.Iron Flask is made of 18/8 Stainless steel that is 100% BPA free and non-toxic.It will never leave a metal taste or rust.The powder coat exterior finish is a classic. It assures that you stand out with a very durable and elegant bottle. Pls check inventory and detailed info before placing your orders.