In reply to UKC/UKH Gear:
For those keen on a non-waterproof foldable peak cap, I've had a frontier cap from Mountain Equipment for a few years and it's excellent.
As a man who's more folically challenged than in my youth, headwear has become an obsession and having a cap that I can fold up and stuff in a trouser pocket is amazing. Comes out with me walking/climbing/skiing/all the time!