Those toes

If you open a sweater up, assuming that it is empty of a human and lying flat on a  nice, soft surface like a bed, Pirelli will dive right in, disappearing deep into it and curling himself quickly into a ball. This is not the time to put your hand in to stroke him. Not unless you're wearing armor. Or armour.

When he relaxes, about 10 minutes later, he will stretch his feet luxuriously, and allow them to show. You may stroke him now, and he will make a small, extended grunt of contentment, before turning himself upside-down and stretching his legs again and spreading his toes