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Waterproofing And DWR

Waterproof garments are designed to keep you dry in wet conditions by preventing water from penetrating through the fabric. There are different levels of waterproofing, typically measured in terms of water resistance and breathability. Here are the main levels:

  1. Water-Resistant: Water-resistant garments are treated with a Durable Water Repellent (DWR) coating, which causes water to bead up and roll off the fabric. However, they are not completely waterproof and may eventually allow water to penetrate, especially during heavy or prolonged rain. Water-resistant garments are suitable for light rain or misty conditions, but they are not designed for heavy downpours or extended exposure to water.

  2. Waterproof: Waterproof garments are designed to keep you dry even in heavy rain or snow. They are constructed with special waterproof membranes or coatings that prevent water from passing through the fabric. These membranes are typically made of materials like polyurethane (PU) or expanded polytetrafluoroethylene (ePTFE), which have microscopic pores that are too small for water droplets to pass through but large enough to allow moisture vapor (like sweat) to escape from the inside, providing breathability. Waterproof garments are often seam-sealed to prevent water from leaking through the stitching.

  3. Waterproof/Breathable: Waterproof/breathable garments offer the best combination of water resistance and breathability. They use advanced membrane technologies to provide superior waterproofing while allowing moisture vapor to escape, keeping you dry and comfortable during physical activity. These garments are ideal for outdoor activities like hiking, skiing, and mountaineering, where you need protection from the elements without overheating or getting sweaty.

  4. Waterproof Ratings: Waterproof garments are often rated based on their level of waterproofing, usually measured in millimeters of water pressure that the fabric can withstand before leaking. Common waterproof ratings include 5,000mm, 10,000mm, 20,000mm, and higher, with higher numbers indicating greater water resistance. Additionally, garments may be rated for breathability using the Moisture Vapor Transmission Rate (MVTR), measured in grams per square meter per 24 hours (g/m²/24h), with higher numbers indicating better breathability.

What Is DWR And How Does It Work?

Durable Water Repellent (DWR) is a special coating applied to fabrics to make them water-resistant. It's commonly used in outdoor clothing and gear like jackets, pants, and backpacks. Here's how it works:

  1. Chemical Coating: DWR is typically made of fluoropolymer or silicone-based chemicals. When applied to fabric, these chemicals create a hydrophobic (water-repelling) surface that causes water to bead up and roll off the fabric instead of soaking into it.

  2. Surface Tension: The DWR coating lowers the surface tension of the fabric, preventing water from penetrating the fibers. Instead, water droplets remain on the surface, making it easier to shake or brush them off.

  3. Breathability: While DWR repels water from the outside, it still allows moisture vapor (like sweat) to escape from the inside. This breathability helps to regulate body temperature and keep you comfortable during physical activity.

DWR Isn't Permanent

Over time, the effectiveness of DWR can diminish due to wear and tear or exposure to dirt, oils, and detergents. When water no longer beads up on the garment, its time to be revived. It can often be revived by washing and reactivating the coating. We recommend using special detergents and treatments designed to restore DWR performance like Grangers Performance Repel Plus and/or Wash + Repel Clothing 2 In 1.

How To Use Revive

Grangers Performance Repel Plus

  1. Spray directly onto a freshly-cleaned, damp garment, focusing more on areas prone to abrassion
  2. Remove any excess product with a clean cloth
  3. Allow to dry naturally or follow the garment care label drying instructions

Wash + Repel Clothing 2 In 1

  1. Use 2 x 50ml caps (100ml) per item (add 50ml for every additional item)
  2. For best results, we recommend reproofing garments separately
  3. Pour product directly into the detergent drawer of your washing machine
  4. Wash on a full cycle or according to care label instructions
  5. Air-dry or tumble-dry if care label permits*
  6. *All Grangers protection products are effective when air-dried. However, for optimum durability, we recommend applying a small amount of heat such as a tumble dryer or hairdryer.