Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Work as advertised and provide a very nice seat cushion as well

My wife and I were surprised the first time we used these. We took them to a nearby beach which can be cold with the wind coming in off the ocean. Not only did the Lava Buns keep us warmer the gel actually provided a more comfortable seat which was an unexpected bonus.They are not difficult to use, removing the gel pack and placing it into a microwave for heating and then putting it back into the cloth pouches. I use a dish towel and it is enough to deal with the heat when pulling them out of the microwave oven.Good quality construction so they can be expected to be used for many years.