The lining of military training clothes refers to a layer of material inside the clothes, which is usually sewn together with the clothes outside. The function of lining is to increase the firmness and comfort of clothing, and at the same time provide the functions of keeping warm, absorbing sweat and expelling moisture. The lining is usually made of soft fabric, such as cotton cloth or synthetic fiber material, to ensure that the wearer feels comfortable in strenuous activities such as military training. The sewing method of the lining can be sewing or bonding to ensure the close combination of the inner and outer clothes and increase the durability of the clothes.