I like the looks of that cup. Is it double walled?
No, I don't think they are, but porcelain doesn't transfer heat well so the drink stays hot.
Here are the specs.
# Silicone sleeve
Protects your hand from excessive heat and prevents the cup from slipping out of your hand.
# Suitable for use with hot or cold items
So you can enjoy coffee, juice and more.
# Dishwasher- and microwave-safe design
Allows for easy cleanup or reheating.
# Porcelain construction
For durability.