This hat rocks. It was a replacement for a PI thermal hat that was out of stock. I love the the way the hat wicks away moisture and the brim keeps the rain off of my face. I rode 40 miles this past Sunday in a cold rain and my head stayed dry and warm. If only it could protect me from the spray off the wheel in front of me.
Having used the Giro merino winter cap for years,
I've given this a try, & it's working well.
Covers the ears, but you can uncover them on the fly for temperature control.
Not overly warm- I used a 2nd thin skull cap for a 40 ride, fits under helmet well.
Get the large size- tight fit cuts circulation.
The best part is the brim, which is enough to keep rain out of the eyes, but doesn't obstruct vision
when in a low position- a problem with many caps including the merino one.
This cap is really good - I use it everyday on my winter commuting rides. I covers my ears and the small brim is good as well. It conforms well to my head and fits snug, but not too tight.
I had an initial concern that it would be either too bulky or not warm enough. Neither was the case. I am surprised at home warm it is for being so thin, but when the temperature drops below 15 F, I put a balaclava over it and I am still able to get my helmet on.