The problem was we needed heat in the water.We were making a cup insulator. We first made a sketch then we made a prototype, and then we made a final product. My claim is that felt was a great insulator. The following sentence highlight my evidence: When the cup with out a insulator it started with 92.6 then ended with 71.1, when with the insulator it started with 87.3 then ended with with 73.9. my reasoning is that there was a big difference when using the felt Some how the felt stoped the heat very well. I am very proud with how good it was at insulating. One thing that I would like to do differently is ad more to the design.