Abstract
The clothing for cold weather were discused. The total insulation in man is made up of sum of the insulation afforded by clothes, air and tissues. A function of clothing is to protect the body from the environment, this is especially true when himalayan expedition. Many expedition to the himalayan high altitude have had useful experiences in the textile and clothing field. Historical development and fundamental matters of clothing for himalayan expedition were explained.
The insulating properties of a fabric are due not to the fibers of the fabric itseif, but to the air trapped with in the fabric. it is impotant to realise that the thermal insulation of clothing is proportional to the thickness of the dead space air trapped within the clothing. Down clothes are extremely warm, light and comfortable.
A windproof outer layer is necessary to prevent penetration by external air. If air penetrates, clothing the trapped dead air is moved and insu1ation will diminish.
Overheating when exercising in the cold with loss of insulation associated with the production of sweat, and thus of darnp clothing, is a well recognized hazard.
It was considered that we must make every effort to be as safe as possible in clothing science field for cold environment.
