One size fits all? Not in this case...this thing is huge. Now before you assume that it's due to my small head, note that all other beanies I've tried on have fit fine. This thing covers my eyes unless I fold the brim.

Looking past this sizing issue however, the beanie is thin, lightweight and quite warm.

If you have a large head, this is for you. If not, beware.

This is the first beanie I have tried that fits comfortably under my bike helmet and keeps my head warm. I have kind of a large head and it covers my ears with no problem. If you have a small head it may be too large.

Great tight-fitting beanie for bald guys. Looks cool, feels great. Icebreaker also has a good one for the folliclly-challenged

My husband has struggled to fine the perfect thin cap to wear under his bike helmet in the colder months. This one is it. I am ordering two more for him.

My head gets too hot in a normal wool beanie on the uptrack, this one is nice and thin and just warm enough. Fits nice under my helmet for the ride down too. Might be too big if you've got a tiny head.

It fits me perfectly, being a bald guy with a large dome-piece. I love this thing. I ordered two of them and they are easily the best fitting/performing technical beanies I have owned.

Initially, I had to wash/dry this beanie to get a better fit...but, once I did that it was perfect!!! Once again, you really can't go wrong with Sugoi for style and function...