We’re not even going to try to explain this, so this is what the maker, Kumeko, says: “Jersey tubes stuffed with polyurethane foam are woven into the 100% wool felt creating a 3D double-sided pattern. The wool felt retains the temperature inside the sleeve and makes the item durable, while the jersey tubes add soft padding.”
Basically, it’s you, in a potato sac. But a nice, expensive one. If nothing else, this should be a great conversation piece when having guests over. So why not get one or two?