It's the latest variation on a "Davy Crockett" hat - self repairing, puts itself on, and doesn't fall off. (Unless it takes a sizeable chunk of scalp with it!) It's about 6 months old and is our border collie's best friend.
(Border collie is a rescue dog, about 10 year old, but behaves like a 2 year old, providing we keep her supplied with glucosamine every day - she had terrible arthritis when we got her. After seeing its effect on the dog, my wife takes it too now!!!)