Adjustable insulating pad / Coaster/pad

Adjustable insulating pad
Design concept:
It just suits to use in the cup of the regular size on the market. If we
can have an adjustable insulating pad to adjust big or small, it will be more
convenient for us to drink.
This product is made of Silicone.
It also can insert into the paper and adjust the size, such as glass bottle,
metal pot,aluminum pot.All of beverages can use it.