This is the best and warmest beanies in the market.
Best option for an easy run in the winder under 20F.
I felt the winter was going away when wear it at a temperature of 12F.
When you running an easy run , you can wear it in the whole time.
When you are in a race, it might be too hot but it will keep you warm after the race or when you lost temperature control during the race.
I will recommend keep this beanie in the pick up bag when in a race.