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Waterproof fabric is designed to prevent water from penetrating through it. This type of fabric typically has a special coating or is made from materials that repel water. Common examples include:

1, TPU or PU Membrane Bonded: A well-known waterproof and breathable fabric often used in outdoor clothing.
Nylon or Polyester with a Waterproof Coating: These fabrics can be treated with a durable water repellent (DWR) finish to enhance their water resistance.

2, พีวีซี (Polyvinyl Chloride): This synthetic plastic is often used for rain gear and tarps, providing excellent waterproofing.
Rubberized Fabrics: Used in items like raincoats, these fabrics have a layer of rubber to block water.
3, PU Coating: A waterproof PU (polyurethane) coating is a protective layer applied to fabrics to make them water-resistant or fully waterproof. PU coatings are commonly used on fabrics for outdoor gear, เต็นท์, and rainwear.
4, Sealed Seams: Many waterproof garments use taped or sealed seams to prevent water from seeping through stitching.
Waterproof fabrics are often used in outdoor gear, sportswear, and various applications where moisture protection is essential.

Fabric water resistance often tested by spary test, เกรด 1-5 （score 0-100）. เกรด 5 (score 100) is the best, regular water resistance fabric spary test is from grade 3 (score 80) to 5 (score 100).

The water pressure of fabric, often measured in millimeters (มิลลิเมตร), indicates how much water pressure a fabric can withstand before it begins to leak. This measurement is commonly referred to as the "water column" rating. Here’s a general breakdown:

0–1,000 mm: Water-resistant fabrics that can withstand light rain or moisture but are not fully waterproof.
1,000–5,000 mm: Suitable for moderate rain and light outdoor use; often used in jackets and gear for less intense conditions.
5,000–10,000 mm: Good for heavy rain and prolonged exposure; ideal for more demanding outdoor activities.
10,000 mm and above: Designed for extreme conditions; often used in high-performance outdoor gear such as mountaineering or extreme weather gear.
The higher the water column rating, the more pressure the fabric can handle before moisture penetrates. However, breathability and comfort are also important factors to consider, especially for active wear.