Stainless Steel exterior Double walled with vacuum insulation Inside has a Borosilicate glass liner Exterior center diamond pattern Matching coloured/clear Acrylic snap-on straw lid with Plastic twisting closure Top of the included straw hides in the top lid; just twist to reveal Sipper hole on the lid can also be used for drinking For use with hot and cold beverages Holds up to 450 ml. (15 oz.) BPA free and FDA compliant Individually boxed See Montego Travel Tumbler for this item without the glass liner Glass liner is removable and can also be used on its own