People often assume nylon is fully waterproof because it’s sleek, smooth, and often used in outdoor gear. But that assumption isn’t entirely true. While 100% nylon resists water better than natural fabrics, it’s not naturally waterproof. The truth lies in how nylon is woven, treated, and finished — not just in the fiber itself.
Think of nylon as a sponge wrapped in a raincoat: the outer surface may repel water at first, but once exposed long enough, moisture finds its way in.
Understanding Nylon’s Nature
What Nylon Really Is
Nylon is a synthetic polymer, a type of plastic fiber first developed in the 1930s. It’s lightweight, strong, and slightly hydrophobic — meaning it repels water to a certain extent.
However, the fiber’s structure is not completely watertight. Microscopic gaps between the fibers allow water molecules to seep through when pressure builds up (like heavy rain or immersion).
| Property | Description | Water Resistance Level |
|---|---|---|
| Fiber Type | Synthetic polymer | Moderate |
| Surface Texture | Smooth and dense | Repels light rain |
| Weave Tightness | Varies by product | Key factor |
| Natural Waterproofing | None | Requires coating |
Why 100% Nylon Isn’t Naturally Waterproof
1. Water Absorption vs. Resistance
Nylon absorbs up to 4–8% of its weight in water, depending on humidity. This means prolonged exposure leads to saturation — the fabric eventually feels damp and heavy.
Compare that with polyester, which absorbs less than 1%, making it more water-resistant by nature.
2. The Role of Fabric Weave
A tighter weave gives nylon better water resistance. That’s why ripstop nylon — used in tents and jackets — performs better than regular woven nylon. But without a coating or laminate, even ripstop will eventually soak through.
How Nylon Becomes Waterproof
1. Durable Water Repellent (DWR) Coating
Manufacturers apply a DWR coating to create a surface barrier that makes water bead up and roll off.
Over time, though, this coating wears off, especially after repeated washing or friction.
| Waterproofing Method | Description | Durability | Common Use |
|---|---|---|---|
| DWR Coating | Chemical layer that repels water | Moderate | Jackets, backpacks |
| PU (Polyurethane) Coating | Plastic-like layer for waterproofing | High | Tents, tarps |
| Lamination | Bonded waterproof membrane | Very High | Technical outerwear |
2. Layering with Membranes
High-performance gear uses membranes like Gore-Tex® or eVent®, which combine nylon’s strength with microporous layers that block water but allow vapor to escape.
This is where nylon truly becomes waterproof and breathable — ideal for outdoor use.
Benefits of Nylon in Wet Conditions
- Quick Drying: Even when wet, nylon dries faster than cotton.
- Lightweight Strength: Holds up well in windy, rainy, or rugged environments.
- Mildew Resistance: Unlike organic fabrics, nylon resists mold and rot.
- Versatile Use: Works well for umbrellas, raincoats, and gear shells.
In short, nylon is the foundation of waterproof fabrics — but it’s the finish that seals the deal.
Risks and Limitations
1. Loss of Waterproofing Over Time
Coatings fade, seams weaken, and microscopic holes form — all reducing water resistance. Reapplying DWR sprays helps restore some protection.
2. Breathability Trade-Off
Fully waterproof nylon can feel clammy because air can’t circulate. That’s why premium outerwear blends nylon with breathable membranes.
3. Environmental Impact
Waterproof coatings often contain fluorocarbons (PFCs) — chemicals harmful to the environment. Many brands are now switching to PFC-free alternatives.
Conclusion
So, is 100% nylon waterproof?
Not by itself. Pure nylon can resist water, but it won’t withstand prolonged exposure without added treatment. To make it truly waterproof, it needs DWR coating, lamination, or a specialized membrane.
Nylon’s strength lies in its adaptability — when properly treated, it transforms from a water-resistant fabric into a storm-proof shield.
Key Takeaways
- 100% nylon is water-resistant, not waterproof.
- Coatings or membranes make nylon gear truly waterproof.
- Tight weaves improve resistance to moisture.
- DWR finishes wear off and require maintenance.
- Performance nylon blends durability with weather protection.
Frequently Asked Questions (FAQ)
1. Can 100% nylon get wet?
Yes. Nylon absorbs small amounts of water, especially during long exposure or heavy rain. It resists moisture better than natural fibers but still gets damp.
2. How do I make nylon waterproof again?
Apply a DWR spray or waterproofing treatment designed for synthetics. Heat activation (like using a dryer on low) helps restore the coating’s effectiveness.
3. Is nylon or polyester more waterproof?
Polyester is slightly more water-resistant because it absorbs less moisture. However, both fabrics need coatings or membranes to be truly waterproof.
4. What happens when nylon stays wet for too long?
Extended dampness can cause odor buildup or weaken coatings, though nylon itself won’t rot like cotton.
5. Can I wash waterproof nylon clothing?
Yes, but use mild detergent and avoid fabric softeners. After washing, reactivate the DWR coating by gently tumble-drying or ironing on low heat.
6. Does nylon dry faster than cotton?
Absolutely. Nylon dries up to five times faster than cotton due to its synthetic composition and smooth fibers.
7. Why is nylon used in rain gear if it’s not waterproof?
Because it’s light, tough, and easy to treat. When coated or laminated, nylon becomes both waterproof and durable, making it ideal for outdoor gear.
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