Here is Wool Boater Hat Factory talking about What is the use of cold hat loops.
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1. Block foreign objects such as snowflakes
The hair of the terry can block snow, ice or other foreign matter from entering the hat.
2. The shock cap impact on the face
In extremely cold conditions, human skin is very fragile, and the loops can alleviate the possible damage to the face by the brim under high wind conditions.
The experiment proves that in the case of minus 20 degrees and 8 winds, the cap is in direct contact with the human body, and the damage to the skin is no less than the damage of the ordinary knife from the half-meter falling blade directly touching the skin at normal temperature. In addition, the soft hair on the terry does not affect the visual field of view. In the snowy days, this is very important for the Newt people who make a living by hunting. It is also very important for friends who cross the road in the cold weather.
3. Reduce the airflow speed around the face
When the wind blows from the front side, the fine hairs on the loops act as winds, slowing the normal flow of air in the face.
4. Expand the horizontal area of the hat
A loop with long fine hair expands the lateral area of the hat, and as the wind blows from behind, the green vacuum area becomes larger.