What is a Water Resistance Rating?

What Is a Waterproof Rating?

If you’ve ever looked at a jacket and seen something like 5,000mm or 10,000mm waterproof rating, you’re not alone in wondering what that actually means.

In simple terms, a waterproof rating measures how much water pressure a fabric can withstand before it starts to leak.

How Waterproof Ratings Work

Waterproof ratings are measured in millimetres (mm) using a test where water pressure is applied to fabric.

Here’s a general guide:

• 1,000mm – 5,000mm → Light rain / short exposure
• 5,000mm – 10,000mm → Moderate rain
• 10,000mm – 20,000mm → Heavy rain / prolonged exposure
• 20,000mm+ → Extreme conditions

The higher the number, the more water the fabric can resist.

⚠️ The Most Important Part : Seam Sealing

Here’s what most people don’t realise: 👉 A jacket is only truly waterproof if the seams are sealed 🦭

Even if the fabric itself is waterproof, water can still get in through the stitching holes and seams where panels are joined.

Seam sealing involves applying a waterproof tape over the seams to stop water from entering.

Why Seam Sealed Jackets Cost More

Seam sealing is a more complex manufacturing process.

Each seam must be sealed individually, which increases production time and cost but it’s what turns a water resistant jacket into a genuinely waterproof one.

How We Show This at House of Uniforms

We make this easy for you:

👉 If a jacket is seam sealed, we clearly note it on the product page.

That way you can quickly identify which jackets are properly waterproof, not just water-resistant.

Waterproof vs Water Resistant (Quick Summary)

• Water Resistant → Handles light rain and drizzle
• Waterproof (Seam Sealed) → Built to keep you dry in storm conditions

Choosing the Right Jacket

If you’re:

• Commuting → Light to mid waterproof rating
• Working outdoors → Look for seam sealed jackets
• Dealing with heavy rain and bad weather → Higher ratings + seam sealing essential

👉 Browse our range of Jackets here

🛍️ Shop fully waterproof, seam sealed jackets, bags and more here