Well, I use my French Press mostly at my friend Tiffani's house. They have an enclosed porch that is the smoking room. When I'm sitting out there, ten minutes after the hot water is poured into the French press the coffee is cold. I found the Natural Coffee Cozies by Bernat Design Studio pattern and decided wool would be best at keeping it warm. Right now, I'm just worried that after I felt the piece and stick it on the French press, it'll shrink and break the beaker. We will see...