If you ride a motorcycle, they are just right; at temperatures up to 8 degrees, they keep your feet warm. I haven't tried lower temperatures, they are thick and tall, covering almost the entire calf

Use at temperatures -3 to -4 keep feet warm without problems. Very good material quality! Special reinforced weaving on the sole and heel. Excellent choice! Be careful when applying at temperatures above 10 - 11 degrees. The foot warms up to a point that causes discomfort.