Not so good. Underwear is generally best to be natural or light. Because of its low consumption of dyeing raw materials, and vice versa. The higher the chemical composition. The heavier the skin irritation surface, the more underwear manufacturers do. Therefore, it is better to choose light underwear. If it takes a long time, it will be bad. Black is dark. It is best to choose light underwear. Dark clothes use more dyes and have higher chemical composition than light clothes. Underwear is in close contact with sensitive skin, and it is definitely not good to wear it for a long time.