Double-walled vacuum insulating body and purely stretch-formed liner ensure that the tumbler is incredibly good at heat preservation. Every tumbler was tested to guarantee its high vacuum degree to keep your drinks cold for up to 12 hours and hot for up to 6 hours.
The tumbler body is made of food grade 18/8 stainless steel. 20 0Z Tumbler double wall. The exterior and liner, both 0.5mm thick, are sturdy and durable. Use of quality eco-friendly plastics makes the transparent splash-proof lid smell- and BPA-free.
Due to its Vacuum insulated design, the tumbler never sweat. The upper body's large diameter allows easy cleaning; the lower body's small size makes the tumbler fit in standard sized cup holders.
The Transparent Lid is Specially Designed to Allow You To See Exactly What You Are Drinking and How Much is Left. (NOTE: When the tumbler is full with overheated drinks, please don't cover the lid too tight, and you can open the bottle mouth, in case the lid pushed up slowly by the pressure of steam and causes splash)