When shopping for fishing waders, you’ll often come across specifications like these:
Waterproof Rating: 20,000mm
Breathability Rating: 4,000g/m²/24h
Some waders advertise a waterproof rating of 10,000mm, while others claim 20,000mm or higher. Breathability ratings can vary just as much, ranging from 4,000 to 10,000, 15,000, or more.
But do higher numbers always mean better waders?
Not necessarily.
Waterproof and breathability ratings are useful indicators of fabric performance, but they don’t tell the whole story. They can’t fully predict how comfortable, durable, or waterproof a finished pair of waders will be.
Let’s break down what these numbers actually mean and how you can use them when choosing your next pair of fishing waders.
1. What Does a 20,000mm Waterproof Rating Mean?
Waterproof ratings are commonly expressed in millimeters (mm).
This measurement refers to hydrostatic head, which describes how much water pressure a material can resist under laboratory test conditions.
For example, a waterproof rating of 20,000mm represents pressure equivalent to a 20-meter column of water.
Important: A 20,000mm waterproof rating does not mean you can safely wade into water 20 meters deep. It’s a laboratory measurement of water-pressure resistance, not a safe wading depth.
It also doesn’t guarantee that a finished pair of waders will never leak.
Fishing waders have multiple components, including fabric panels, stitched seams, seam tape, neoprene stockingfeet, and connections between different materials.
Even if the fabric performs well in a waterproof test, the finished garment depends on how these components are assembled.
That’s why waterproof ratings are helpful, but construction quality matters just as much.
For additional technical background, SATRA’s hydrostatic-pressure testing explanation describes how materials can be evaluated under increasing water pressure.
2. What’s the Difference Between 4,000 and 10,000 Breathability?
Breathable waders are designed to keep external water out while allowing some moisture vapor from inside the garment to move outward.
This is where breathability ratings come in.
One common measurement is MVTR, which stands for Moisture Vapor Transmission Rate.
It’s often expressed as g/m²/24h, meaning grams of water vapor transmitted through one square meter of material over a 24-hour reporting period under specified test conditions.
A Simple Breathability Comparison
| Breathability Rating | What It Indicates |
|---|---|
| 4,000g/m²/24h | A measured amount of moisture vapor passes through the material. |
| 10,000g/m²/24h | More vapor passes through under identical testing conditions. |
| 15,000g/m²/24h | A higher vapor transmission rate under identical testing conditions. |
At first glance, you might assume waders rated at 10,000 are significantly more comfortable than those rated at 4,000.
But it’s not that simple.
Key takeaway: A breathability rating twice as high doesn’t mean the waders will feel twice as breathable when you’re fishing.
Different manufacturers may use different testing methods, temperatures, humidity levels, or material configurations.
Even when two products use the same units, their numbers may not be directly comparable.
The ASTM E96/E96M standard, which addresses water vapor transmission testing, highlights why test methods and conditions matter.
Real-world comfort also depends on the weather, your activity level, and what you’re wearing underneath your waders.
Think of breathability ratings as useful reference points rather than guarantees of comfort.
3. Which Matters More: Waterproofing or Breathability?
Both matter, but they serve different purposes.
Waterproofing helps prevent external water from passing through the material.
Breathability describes how readily moisture vapor can move through the material.
Which one deserves more attention depends partly on how and where you fish.
Standing in a Cold River
If you spend long periods standing in cold water, dependable waterproof construction is essential.
Fabric performance matters, but so do seam integrity, stockingfoot connections, and overall construction quality.
Hiking and Fishing in Warm Weather
If you frequently hike between fishing spots or cover long distances, heat and moisture buildup can become uncomfortable.
Breathability may play a bigger role in your comfort during active use.
However, even highly breathable fabric can’t guarantee that you’ll stay dry inside.
Humidity, temperature differences, physical activity, and your base layers all influence moisture buildup.
The goal isn’t simply to choose the highest rating. It’s to find waders that suit your fishing conditions.
4. What Is RET, and How Is It Different From MVTR?
Some outdoor brands use another breathability measurement called RET, or Resistance to Evaporative Heat Transfer.
Unlike MVTR, RET measures resistance to moisture vapor transfer.
MVTR: Higher numbers indicate greater vapor transmission under comparable testing conditions.
RET: Lower numbers indicate less resistance to vapor transfer under comparable testing conditions.
In other words, the preferred numerical direction is opposite.
An RET value and an MVTR value also can’t be directly converted into each other using a universal formula.
You don’t need to memorize every testing standard before buying fishing waders.
Just remember that different measurements describe different properties, and comparing numbers without knowing the method can be misleading.
Hohenstein’s explanation of breathability testing provides additional background on measuring water vapor resistance.
5. Do Higher Ratings Always Mean Better Waders?
Not necessarily.
When two materials are tested using the same methods and conditions, a higher waterproof rating indicates greater measured resistance to water pressure. Likewise, a higher MVTR indicates greater measured vapor transmission.
But neither number tells you everything about the finished product.
Several other factors deserve attention.
Fabric Durability
Fishing waders regularly encounter rocks, gravel, branches, and other abrasive surfaces.
Even fabric with excellent waterproof performance can be damaged by sharp objects or repeated abrasion.
Material durability is an important consideration, especially if you frequently fish in rugged environments.
Seams and Construction
Waders aren’t made from a single continuous piece of fabric.
Seams, seam tape, and stockingfoot connections must work together to prevent leaks.
A strong fabric rating doesn’t automatically guarantee the same performance at every connection point.
To understand how different layers contribute to wader construction, see our guide to 3-layer vs. 4-layer fishing waders.
Fit and Freedom of Movement
A technically impressive pair of waders won’t be much fun if it doesn’t fit properly.
You should have enough room to bend your knees, walk comfortably, and step over obstacles without excessive tension on the fabric or seams.
Proper sizing is especially important for stockingfoot waders.
Warranty and Repair Support
Waders are outdoor equipment, and damage can happen even with careful use.
Before purchasing, check the manufacturer’s warranty, repair options, and customer support policies.
These details can be just as important to long-term ownership as the numbers printed on a product page.
Remember: The best waders aren’t necessarily the ones with the highest ratings. They’re the ones that combine suitable materials, dependable construction, proper fit, and support for the way you fish.
6. If the Outside Fabric Gets Wet, Does That Mean Your Waders Are Leaking?
Not always.
When waders are new, you may notice water forming droplets and rolling off the exterior fabric.
After extended use, the outer material may begin to look darker or feel saturated.
This doesn’t automatically mean the waterproof membrane has failed.
Many waterproof-breathable fabrics use a surface treatment called DWR, or Durable Water Repellent.
DWR helps prevent the face fabric from absorbing water.
As the treatment wears down, the outer fabric may become saturated, a condition often referred to as wetting out.
However, the waterproof barrier underneath may still be functioning normally.
In other words, a wet-looking exterior doesn’t necessarily indicate a leak.
The opposite is also true: water beading on the outside doesn’t prove that every seam or connection is completely waterproof.
GORE’s explanation of DWR describes the difference between surface water repellency and the waterproof membrane underneath.
Understanding this distinction can help you avoid mistaking normal surface wetting for a damaged pair of waders.
For more information about maintaining wader materials, read our guide to cleaning, drying, and storing fishing waders.
7. What Should You Check Before Buying Fishing Waders?
You don’t need to become a textile engineer to choose a good pair of fishing waders.
A few practical questions can help you make a more informed decision.
Quick Buying Checklist
- Are the ratings clearly stated? Look for complete waterproof and breathability units.
- Are the testing methods comparable? Different brands may use different procedures or conditions.
- How is the finished wader constructed? Consider seams, seam tape, stockingfeet, and other potential leak points.
- Does the fit match your fishing style? Think about walking, bending, layering, and your fishing environment.
- What happens if something goes wrong? Review warranty coverage, repair services, and customer support.
If a manufacturer provides information about its testing methods, that’s useful additional context.
If the methods aren’t disclosed, it doesn’t automatically mean the product is poorly made. It simply means there may not be enough information to compare its laboratory ratings directly with another product.
Final Thoughts: Use the Numbers, but Don’t Let Them Make the Entire Decision
Waterproof and breathability ratings can help you understand what a fishing wader’s materials are designed to do.
A waterproof rating describes resistance to water pressure, while an MVTR breathability rating describes how much water vapor passes through a material under specified test conditions.
Both are useful, but neither can guarantee comfort, durability, or leak-free performance in a finished pair of waders.
When comparing fishing waders, consider the ratings alongside construction quality, fit, fishing conditions, and warranty support.
The highest numbers don’t always make the best waders. The better choice is the pair that meets your needs on the water.