I quite like a wool hat with fleecy lining. I have a very cosy one which is tweed with fleece lining. I find the combination of the fabrics works well.
I buy mine from wee local crafty places or make them myself, so can't actually recommend a particular one.
I haven't found a hat better than the Fjallraven classic knit to keep my slaphead warm in properly cold weather. 100% merino wool, super warm, breathes well, lasts forever, doesn't bobble.
The best hat for extreme cold is a hood, as you get full ear and neck coverage. In even more extreme cold you can't beat a 'ushanka' style hat, the ear warmth is unmatched and on a good one you can tie your ear flaps up for beanie mode
The possum fur and merino beanie from the Ray Mears shop is by far the warmest wool hat I've worn. Somebody got me one for a present a few years ago but I've only worn it a few times since, because it's too hot on all but the bitterest days. It also looks like the sort of hat Ray Mears would use.
I have several wool beanie hats. The warmest is a 3M Thinsulate . it's also supposed to be waterproof, but I have no plans to ever test that theory. I bought mine at the local mill shop a few years back.
My oldest kid got me a possum/merino cardie for my birthday - an amazing fabric. Much better than my tattered goose down. I thought it sounded a bit 'gimmicky' when I got it, but I'm sat in the 4am garden at -5 and perfectly toasty.
Aclima WarmWool Beanie has thick wool and a clever fish net style lining, this and the Brynje equivalent are very warm and popular in cold if you want a beanie rather than mountain cap / ear flap style hat. They are expensive though.
I've a Fjallraven Expedition down hat thingy, it's actually hideous when it's only -10 or so as one sweats like hell, it was a gift and I never use it!
Press Release Alpkit and Outside Bank Holiday Hathersage Tent Show 4-5th May
News Place Nicknames Added to Tool to Aid Emergency Services
Ordnance Survey is inviting emergency service organisations around Great Britain to input local and colloquial nicknames to a new database called the Vernacular Names Tool, as an aid to getting responders to the right location even if...