I have one which i use when its really cold they really keep the noggin warm however if you need a haircut like me then when you take it off you can end up looking like the doc outta back to the future…
‘Bobble’ every time as they are longer than a mincey ‘Beanie’ and can be pulled further down the back of your neck (further keeping that nasty old draft out!) and to the top of your eyebrows, therefore keeping ye olde earlobes warm as well!!
bp garages (well, my local one anyway) are doing a special on Thinsulate ones for £2.99, they’ve got a soft warm layer on the inside, lovely things. and they do the gloves as well.