Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: WOW! How does this keep coffee hot for so long?

I filled this up with hot coffee and forgot about it - 24 hours later when I remembered the coffee was still more than hot enough to drink. It's amazing how well this thing works! It's also stainless inside so there's no worrying about breaking like all of the glass lined ones I've had in the past. Highly recommended.