Material | Stainless Steel. Color | Gold. 30oz stainless steel tumbler. Double-wall vacuum insulation technology. Cold up to 24 hours, hot up to 12 hours. Crafted from 304 grade 18/8 stainless steel. BPA free. Highly resistant to rust, absorbing odor, retaining taste and bacteria. Easy to clean by hand. Clear lid seals tightly while allowing you to see inside. The lid is dishwasher safe and shatter resistant. Sweat free.