Is Nylon Waterproof? Everything You Need to Know

People often ask whether nylon is waterproof. Although nylon offers some water resistance, it is important to note that it is not inherently waterproof.

Last Updated on  December 16, 2025 by Gentle Packing Team

Let’s explore this topic further. In this article, we’ll dive into everything you need to know about nylon’s waterproofness, waterproofing treatments, and how it compares to other materials like polyester.

What Is Nylon?

Nylon is a type of synthetic material made from polymers, which are long chains of molecules. It was created by the chemical company DuPont in 1935 and became one of the first fully synthetic fibers used in textiles. Nylon is known for its strength, elasticity, and wear and tear resistance.

It is often used in products like clothing, bags, outdoor gear, and even industrial applications because it is durable and versatile. Despite being a synthetic polymer, nylon is relatively lightweight and offers good abrasion resistance. It also has some water-repellent properties, though it is not completely waterproof without additional treatment.

Read more: The Ultimate Guide to Nylon Fabric. 

Is Nylon Waterproof or Water-Resistant?

One common question people have is whether nylon is waterproof or water-resistant. The answer is that Nylon in its natural form is not completely waterproof. Instead, it is generally water-resistant. It depends on the type of nylon fabric and how it has been treated.

This means that nylon can handle light rain and some moisture but will eventually absorb water under extended exposure. Some types of nylon, however, are treated with special coatings or laminated to enhance their water-resistant or waterproof properties.

However, some types of nylon material are treated with special coatings to improve their water resistance or make them waterproof. These treatments are especially common in bags, tents, and outdoor apparel designed to withstand water penetration.

The following are hydrostatic pressure stops for common nylon materials:

Material	Grams/1000m	Thread (Denier)	Avg. Fabric Density (g/m²)	Water Resistance (mm H2O)
Nylon 20D	22–25	20D	30–40	1000–2000
Nylon 40D	45–48	40D	50–70	2000–3000
Nylon 70D	70–75	70D	100–120	3000–5000
Nylon 100D	100–110	100D	130–150	4000–6000
Nylon 210D	210–220	210D	200–300	5000–8000
Nylon 420D	420–450	420D	400–500	8000–12000

Why Does Nylon Have Water Resistance Properties?

Nylon’s water-resistant properties stem from its hydrophobic hydrocarbon chains, tight weave structure, and the ability to apply coatings or treatments. However, it’s important to note that untreated nylon is water-resistant but not fully waterproof—prolonged exposure to water may eventually lead to water penetration.

• Hydrophobic Nature of Nylon

• Tight Weave Structure: Higher denier nylon (e.g., 70D, 100D) is often more water-resistant than lower denier fabrics.

• Coatings and Treatments: PU coating or silicone coating, and DWR treatment.

• Low Absorption Capacity: Compared to natural fibers like cotton, nylon has a much lower water absorption rate (about 4-8%). 

• Heat-Sealable Properties: Reduces the number of pores and seams in the fabric.

Water Resistance vs. Waterproof

Waterproof and water resistant are two concepts that are often confused with each other. However, there are some essential differences between the two terms. If you need absolute water resistance or protection against water penetration, understanding these terms will help you make an informed choice.

• Water-resistant: It refers to the ability to prevent water infiltration. Fabrics labeled as water-resistant can handle light rain or splashes. Over time, they will absorb moisture if exposed to water for too long.
• Waterproof: It is an object or structure that can provide complete protection even when subjected to water pressure. Waterproof fabrics completely block water, keeping moisture out even during heavy rain or prolonged exposure.

In short, water-resistant nylon is great for light rain, while waterproof nylon offers a higher level of protection against water infiltration.

How to Test Nylon’s Water Resistance: Key Standards and Ratings

Several tests can measure how well nylon resists water, including a hydrostatic head test, which measures the water pressure that a fabric can withstand before it begins to leak. The results help classify nylon fabrics based on their water resistance.

Moderately water-resistant fabrics can withstand a certain level of water pressure, while absolute water resistance means that the fabric can withstand high water pressure without allowing water to seep through.

Understanding IP Ratings and Nylon Waterproofing

Do you know IP? When evaluating waterproofing standards, IP ratings (Ingress Protection) are important. These ratings define the degree of protection against solids and liquids:

• First character (solid objects): Ranges from 0 (no protection) to 6 (full protection).
• Second character (waterproof protection): Ranges from 0 (no protection) to 8 (suitable for water immersion greater than 1 meter).

What does IP means?

For example, IPX6-rated fabrics can resist powerful water jets, while IPX7-rated fabrics can be immersed in water up to 1 metre deep for up to 30 minutes.

Nylon Water Resistance Standards

The Nylon Water Resistance Levels provide a clear way to determine how well nylon fabrics can handle water exposure under different conditions. Here’s a breakdown of each level：

• Water Resistance Level W1: Low-level water resistance. Ideal for light rain or splashes, this level repels small amounts of water but will not withstand extended exposure.
• Water Resistance Level W2: Medium-level water resistance. Designed to withstand moderate rain or snow, this level provides more protection but may still allow some moisture to seep through after prolonged exposure.
• Water Resistance Level W3: High-level water resistance. Suitable for heavier rain, showers, and more demanding conditions, this level offers solid protection but may not hold up under intense or prolonged rainfall.
• Water Resistance Level W4: Very high-level water resistance. This level will withstand seawater, swimming, and shallow diving, providing full protection and is ideal for water-related activities in light to moderate conditions.
• Water Resistance Level W5: Absolute water resistance. This grade can withstand harsh conditions such as deep diving and constant exposure to seawater, ensuring full waterproof penetration protection in extreme environments.

Types of Nylon and Their Waterproof Capabilities

Not all nylon are created equal when it comes to water resistance. Some types of nylon, such as nylon 6/6, are more resistant to water due to their stronger chemical structure.

The thickness and weave of the fabric also play a significant role in determining how well it resists water.

• Pure Nylon: Basic water resistance, ideal for light rain but not for heavy exposure.
• Nylon 6: Higher durability and better water resistance than pure nylon.
• Nylon 66: Nylon 66 is the most common type of nylon and offers excellent water resistance.
• Nylon 6/66: It is a blend of nylon 6 and nylon 66 that provides better water resistance than pure nylon 6.
• Nylon 6/12: Excellent moisture resistance, commonly used in high-humidity applications.
• Coated Nylon: Features a waterproof coating or DWR treatment, providing enhanced water-resistant properties.

Factors Affecting Nylon’s Water Resistance 

Several factors can influence how well nylon water-resistant fabrics perform in different conditions. These include:

1. Nylon types: Some types of nylon show excellent water resistance compared to others. You can use nylon 66 for applications requiring complete waterproofing.
2. Fabric thickness: Thicker fabrics generally offer better protection against water penetration.
3. Coatings and treatments: Waterproof coatings and DWR treatments improve nylon’s water resistance.
4. Weave and finish: A tight weave or specialized finish can enhance water resistance.
5. Environmental factors: Hot and humid environments or extreme cold weather may impact how well nylon fabrics perform in water-resistant applications.

How Climate and Environmental Factors Affect Nylon’s Water Resistance? 

While nylon offers decent water resistance, it’s important to remember that climate can play a significant role in its performance:

Temperature & Humidity: In hot and humid conditions, water molecules become more energetic and can more easily find their way through the gaps in nylon’s structure, leading to faster water penetration. Conversely, in cooler, dry environments, nylon tends to perform better at keeping moisture out.

Factor	Effect on Water Resistance
Temperature & Humidity	May decrease resistance
Fabric Thickness	Increased thickness = better
Weave/Finish	Tighter weaves protect better
Coatings/Treatments	Enhance overall resistance

By considering these variables, you can make a more informed decision about which type of nylon will best suit your application and environment.

Designing Nylon Products for Enhanced Water Resistance

When aiming to boost the water resistance of nylon products, smart design modifications can make a world of difference. Incorporating certain features helps divert water away from vulnerable spots and reduces the risk of moisture seeping inside.

Effective Design Strategies:

• Sloped Surfaces and Directional Channels: Adding angled surfaces or built-in channels to your nylon gear encourages water to flow off quickly, rather than puddling in place. For instance, jackets, backpacks, or technical equipment that feature sloped seams or molded water run-off grooves are much less likely to accumulate standing water. This makes DWR-coated surfaces even more effective.
• Seam and Closure Innovations: Elevate the protection by thinking about how seams close and panels join together. Overlapping flap designs and downward-facing seam orientations help block water entry points, much like you’d find on well-crafted rain jackets or high-performance outdoor gear.
• Enhanced Sealing During Design: For products requiring top-tier water resistance, like waterproof electronics cases or industrial components, integrating sealing methods during the initial design is key. This includes designing parts to accept rubber gaskets or O-rings, or creating interlocking edges that compress tightly together for a nearly watertight seal. This approach is common in outdoor gear from brands like Patagonia or Arc’teryx, where every design element aims to keep moisture at bay.
• Strategic Reinforcement: Finally, reinforcing typically weak points—such as panel junctions, zippers, and attachment points—with water-resistant materials or extra barriers can further shield the product from penetration.

By prioritizing these design elements, you can significantly improve how well your nylon products shed water and protect their contents from the elements.

How to Improve Nylon’s Water Resistance?

If your nylon gear is not waterproof, you can enhance its water resistance through various treatments:

• Durable Water Repellent (DWR): A treatment that makes water bead off the surface of the fabric, preventing it from soaking in.
• Waterproof coatings: These provide a protective layer on the nylon fabric, offering full waterproof protection.
• Sealing techniques: if you need a higher degree of water resistance, you can also use sealing techniques during the design phase

How to Properly Maintain Water-Resistant Nylon?

In addition to additional coatings, proper maintenance is the key to ensuring that nylon is waterproof for the long term. Here are some easy tips to maintain nylon’s water resistance.

1. Clean and Dry Nylon Correctly

It is best to hand wash with cold water and a mild detergent. After the fabric gets wet, it’s important to dry it properly to maintain its water resistance.

2. Avoid exposure to sunlight and high temperatures

Nylon dries faster than natural fibers such as cotton, but proper drying is essential to maintain its quality. But Protect from direct sunlight; sunlight and heat can degrade the waterproof material on nylon.

3. Avoid using strong chemicals

Avoid bleach or harsh chemicals that can damage the nylon surface and coating.

Water Vapor Transmission Rate (WVTR) and Nylon’s Breathability

While nylon does an excellent job of keeping water out, it’s important to consider how it handles internal moisture, such as sweat. Water Vapor Transmission Rate (WVTR) measures how easily water vapor can pass through the fabric.

Nylon, despite being water-resistant, generally has a lower WVTR than natural fibers like cotton. This means that while it can block rain or water splashes, it’s less effective at allowing sweat vapor to escape. In hot and humid conditions, this can lead to trapped moisture inside the fabric, creating a damp and uncomfortable feeling.

Some advanced fabrics combine nylon with breathable membranes, like Gore-Tex, to enhance breathability while maintaining water resistance. These high-performance materials balance waterproofing with increased vapor transmission, making them ideal for hiking, running, or any outdoor activities where comfort and protection are equally important.

Applications of Water-Resistant Nylon Fabric

Water-resistant nylon is used in many applications where light moisture or rain is expected. These include:

• Outdoor gear: Jackets, backpacks, tents, and sleeping bags made with nylon water-resistant fabrics are ideal for light rain and moisture exposure.
• Sportswear: Nylon material is often used in sports gear, offering comfort and protection in humid or wet conditions.
• Luggage and bags: one of the most common uses of water-resistant nylon is in travel gear and nylon bags.
• Marine equipment: The waterproof properties of nylon make it an excellent choice for marine environments where exposure to water is common, such as Marine Ropes & Lines, Sails & Covers, and waterproof storage bags.
• Industrial Components: Waterproof nylon work jackets and trousers are usually found in industrial environments such as construction sites and factories that are exposed to rain or moisture.

Examples of Nylon Components with Enhanced Water Resistance

Water-resistant nylon isn’t just for clothing and bags—it’s also finding its way into a variety of specialty components across different industries. Here are a few notable examples where improved water resistance in nylon makes a difference:

• Drone Accessories and Housings:
  Many drone manufacturers now use SLS 3D-printed water-repellent nylon to create battery compartments or housings for essential electronics. While these parts aren’t designed for full immersion, they offer reliable protection from splashes, drizzle, and ambient moisture encountered during outdoor flights. Smart design features, such as integrated seals or strategic overlaps, can further minimize the risk of water ingress.
• Aerodynamic Covers for Electronics:
  In environments where electronics are exposed to unpredictable weather—think open-air robotics, agricultural drones, or even RC boats—water-resistant nylon can be shaped into housings that help stave off light rain and accidental sprays. This extra water resistance keeps core components functional and extends their lifespan even in less-than-ideal conditions.
• Plumbing System Components:
  Nylon’s durability and water-repellent qualities make it suitable for non-pressure applications in plumbing. For instance, drainage spouts and inspection covers produced by CNC machining are commonly made from water-resistant nylon. These components direct rainwater away from structures or provide easy access for maintenance, all while offering a basic shield against leaks and surface moisture.

The combination of water-resistant properties and robust engineering has made nylon an increasingly popular material for situations where utility and protection from the elements are equally important.

3D Printed Nylon (SLS): Where Water Resistance Meets Innovation

When it comes to nylon, traditional fabrics aren’t the only arena where water resistance shines. Modern advancements like SLS (Selective Laser Sintering) 3D printing have pushed the limits, making nylon a top choice for durable, moisture-resistant components—especially when the right treatments or sealants are added. But what does this mean for practical, everyday uses?

Everyday Uses for Water-Resistant 3D Printed Nylon

1. Electronics Enclosures and Components
   Just like your travel bag keeps your belongings dry, SLS-printed nylon is often used to create enclosures for electronics that need a bit of buffer from rainy commutes or the occasional spill. For example, drone battery housings and protective covers benefit from the water-shedding properties of treated SLS nylon, offering solid protection against splashes and humidity—although you probably wouldn’t want to take them swimming.
2. Lightweight, Functional Parts in the Field
   From mounts for action cameras to intricate airflow ducts in automotive prototypes, SLS nylon’s blend of toughness and water resistance makes it ideal for outdoor gear and sporting equipment. Imagine bike components, hiking gear clips, or even hydration-pack frames—all benefiting from moisture deflection and robust performance, much like the jackets or bags you’d pack on an adventure.
3. Industrial and Marine Applications
   In settings where exposure to water is more than just a passing cloud, industries are using SLS-printed nylon for custom machine housings, water-resistant cable guides, and even housings for marine electronics. These parts take inspiration from nylon’s proven use in marine ropes and rugged outdoor apparel, further extending its reputation for handling wet environments.
4. Robotics, Drones, and Aviation
   As drones soar through changing weather, their protective shells and internal structures—often 3D printed from nylon—take advantage of its water-repellency. This safeguards delicate electronics from light rain or mist, much like how waterproof hiking jackets shield you from a drizzle.

So, whether you’re flying a drone on a damp morning or looking to build a custom, water-resistant part for your next project, SLS-printed nylon is a modern solution that channels the same qualities outdoor enthusiasts have relied on for decades.

Key Differences Between Nylon and Polyester in Waterproofing  

While nylon is often praised for its water resistance, it’s important to understand how it compares with polyester, another popular synthetic fabric. Both materials can used in foldable bags, outdoor gear, etc. 

1. Water Resistance and Durability

Nylon has a higher natural water resistance compared to polyester, especially when treated with waterproof coatings like DWR. It is stronger and more durable, making it better suited for outdoor gear subjected to heavy use.

Polyester generally has lower water resistance than nylon. While it can resist some moisture, polyester absorbs water more easily. Polyester is, however, more resistant to UV degradation, meaning it doesn’t break down as quickly under sunlight as nylon does.

Please note: For applications requiring complete waterproofing or submersion, other materials or techniques might be more suitable. Options like wax, polyester (PET), and thermoplastic polyolefin (TPO) can be used to achieve full waterproofing and, in some cases, may serve as alternatives or substitutes for nylon.

This means that while both nylon and polyester are great for general water resistance, choosing the right material depends on the specific demands of your project—whether you need greater strength and durability, improved UV resistance, or absolute waterproofing for total submersion.

2. Moisture Wicking

Nylon does absorb some moisture, but it dries quickly, making it a good option for outdoor activities in moderate conditions. However, it is less effective than polyester in wicking moisture away from the skin.

Known for its superior moisture-wicking properties, polyester is often used in sportswear because it pulls sweat away from the body more effectively than nylon.

3. Cost and Availability

Nylon tends to be more expensive than polyester due to its production process and superior durability.

Polyester is more cost-effective, widely available, and commonly used in everyday items like clothing and accessories.

Conclusion

In summary, nylon is generally water-resistant, but it’s not fully waterproof unless treated with special coatings or laminated layers.

While it can handle light rain and moisture, it may absorb water over extended periods of exposure. By applying DWR coatings or using higher-grade nylon, you can significantly enhance its water resistance, making it suitable for more demanding conditions.

Nylon’s water resistance is thanks to its tightly woven structure and strong amide bonds, which initially repel moisture. However, the material still contains microscopic gaps and hydrophilic (water-attracting) patches. Over time—especially during prolonged or heavy exposure—water can find its way through these pathways and seep into the fabric. This means nylon is best suited for light showers or short-term contact with water, rather than heavy, sustained downpours.

For applications requiring complete waterproofing or submersion, it’s worth considering alternatives such as polyester, thermoplastic polyolefin (TPO), or adding wax-based treatments. Additionally, design features like sloped surfaces and built-in channels can help water run off more efficiently, further improving nylon’s performance in wet conditions.

Ultimately, while nylon offers basic water resistance, it’s important to match the material and any treatments to the level of moisture exposure you expect. For truly waterproof needs, look to specialized coatings or alternative materials.

FAQs

Is Nylon Waterproof or Water-Resistant?

Nylon is usually water-resistant, but it can be made waterproof with special coatings or treatments like Durable Water Repellent (DWR).

Can Water-Resistant Nylon Be Recycled?

Yes, many types of synthetic fabrics, including nylon, can be recycled, although the process varies depending on the fabric and its treatments.

Is Nylon Waterproof in Specific Situations?

Waterproof nylon is designed to handle specific conditions, such as heavy rain, but it may not perform as well in extreme conditions unless treated for added protection.

Is Nylon More Water-Resistant Than Polyester?

Both nylon and polyester fabrics offer water resistance, but nylon water-resistant fabrics generally perform better, especially when treated with DWR coatings. On the other hand, polyester fiber is quick-drying, easier to dry, and abrasion-resistant.