1. Material Requirements
The main material requirements for thermal underwear are: fabric, lining, filling, etc. The fabric should be soft and comfortable, wrinkle-resistant, waterproof and oil-proof materials, the lining should be fiber fabric or elastic fiber fabric, and the filling can be made of chemical fiber or down and other materials.
2. Processing requirements
The processing requirements of thermal underwear are a very important link, mainly including stitching, uniforming and dyeing. Among them, the stitching requirements should be firm, flat and beautiful, the uniform should have the characteristics of heat preservation, moisturizing and breathable, and the dyeing should have the advantages of environmental protection, durability and not easy to decolorize.
3. Quality requirements
The quality requirements of thermal underwear mainly include size specifications, appearance quality, mechanical properties, safety performance, etc. The size specifications should meet the requirements of the standard, the appearance quality should be neat, smooth and flawless, the mechanical properties include tensile strength, bending performance, etc., and the safety performance mainly includes wear resistance, tear resistance, heat resistance, etc.
