Spill Proof  Hot and Cold  Anti Skid or Anti Fall Vacuum Suction Base Non Slip Tea Coffee Cup Stainless Steel Mug  (470 ml) This mug has a double walled exterior with a vacuum between the walls. Even filled with ice or boiling water, the mug will never sweat or get hot to the touch! Thanks for the clever gripping-pad design at the base. If you accidentally knock into it, the cup will not knock over. This can protect your document or keyboard from water, and bring much convenience for your work. You're worth it!