noglider 

Today I gave my new snowboarding helmet its first real try, riding 14 miles to work. I'm very happy. I never was sufficiently warm with a hat under a cycling helmet. The only trouble is that I don't know how to use my bluetooth headphones with it. The helmet pushes the buttons which are on the right ear of the headphones. In one minute, it dialed the phone twice.

elcruxio

Some helmets have earphone ear protectors as a sold accessory.

I just got a new ski helmet and finally I can use a helmet during winter. A bike helmet with stuff under was never an option

gregjones

I find that winter sports equipment (ski/boarding) stuff works quite well on the bike. I hadn't ever thought about a helmet. I just put a helmet cover on below about sixty degrees and use earwarmers in the forties and high thirties with a balaclava below that. I was quite surprised at the ability of just a cover make as big of a difference that it does. No way I can use my summer helmet without one.

noglider 

Duh. I just realized I could use the left ear instead of the right ear. The right ear is the one with the buttons. But the protector is something to look into.

Miele Man

I have an oversize bicycle helmet
I use when it's really cold. I have a safety orange touque that I stretch over it as a cover. As you said, a cover alone makes quite a difference in warmth. I also have a balaclava that i wear under it. That's why I bought this helmet in a larger size. that way the helmet still sits low where it's supposed to. Btw, I melted a hold through the cover so that my helmet mirror can still go into the mount on the helmet.

Cheers

noglider 

An oversize helmet is not an option for those of us with oversize heads.

elcruxio

And I could never get warm enough with a regulat helmet as I can't fit enough stuff underneath to cut the wind.

A ski helmet creates a barrier with the goggles which extends down to my nose which in turn isn't nearly as cold sensitive as my forehead.

And an oversized head doesn't help with the stuffing underneath part

Tim_Iowa

Tell me about it! I bought a Bern helmet last year in XXL and it was too small. I returned it for the XXXL and that just about fits. It's pretty tight if I wear a skullcap underneath.

I found a Bern Brentwood online which included both the summer and winter liners. It's a great helmet for 3-season riding (fall/winter/spring), but even with the added ventilation (compared to the older Bern hardhat style) I can't wear it in the summer.
It works great for winter riding, and I added the goggle clip on the back to hold my goggle strap. I use Oakley O2 XL goggles, and they work well.

I use a cheapo Bell XLV (in mongo size) for summer riding.

When I was getting my uniforms issued in the Air Force, we kept trying on caps until I ended up with a size 8, the biggest the uniform shop had. It was all the way to the right on the top shelf, and a little dusty.