Waterproof fabric refers to fabric that has undergone technical treatment based on BEGOODTEX's permanent flame retardant fabric to create a stable air interface protective film on the fabric surface. This treatment enables the fabric to achieve waterproof, oil-proof, and stain-proof functions. This treated fabric is called "three-proof" fabric.

The waterproof function is achieved by coating a layer of waterproof film on the surface of the fabric. This film can prevent water penetration without closing the fabric's pores, allowing the fabric to be both waterproof and breathable.