【insulation & extra wide design】: 30 oz double wall tumbler is extra thickness- outer wall 0.6mm and inner wall 0.5mm, which ensures keep hot for 6 hours, cold for 24 hours.
【high quality material】: both inner and outer wall are made of 18/8 304 food grade stainless steel, the high rigidity of 30 oz insulated tumbler can make tumbler not easy to deform; water-proof lid is sturdy and not easy to break.
【cleaning and maintenance】: the powder coated outside makes 30 oz stainless steel tumbler non-slip and sweat-proof. in order to maintain bright color for a long time, we recommend using a sponge and neutral detergent to clean it gently.