Bow Magic Originality Leak Proof Silicone Tea Coffee Mug Cup Lid White There are travel cups that automatically will lower a beverage's temperature. These mechanical travel mugs feature a mechanism that reads the temperature of the beverage inside the cup; if it's too hot, the cup's lid will cool it down a bit as the liquid enters the lid. The lid acts as a cooling chamber and slightly chills the coffee down to a temperature that won't burn your tongue or mouth. You also can bypass this mechanism and drink the beverage as is, if desired Condition: Brand new Size: 10.5cm X 10.5cm X 2cm Weight: 0.05 Kg Material: silicone