Three proofing fabrics are washfree. Three proofing fabrics refer to ordinary fabrics that form a stable air interface protective film on the surface of the fabric after treatment. They are fabrics with excellent waterproof function, oil proof function and antifouling function, commonly known as "three proofing fabrics".

After three proofing finishing, the surface properties of the fabric are changed from hydrophilicity to hydrophobicity, and water droplets can roll on the fabric without wetting. Water resistance and moisture permeability are two important properties of fabrics with opposite and closely related properties.

Waterproof refers to preventing water droplets from entering the interior from the outside of the fabric, while moisture permeability refers to the sweat and moisture emitted from the interior of the fabric through the fabric. Nylon waterproof and moisture permeable fabric and Polyester Waterproof and moisture permeable fabric mean that the fabric can not only prevent rain and wind, but also sweat, breathe and wear comfortably. In the wearing process, the water will not soak the fabric under a certain pressure, while the sweat emitted by the human body can pass through the fabric or be transmitted to the outside world in the form of water vapor, rather than condensing and accumulating between the fabrics on the surface of the human body, so as to keep the clothes dry and warm.