Rain can be a real nuisance, but having the right rainwear can make all the difference. A good raincoat or waterproof jacket can keep you dry and comfortable, even in the heaviest downpours. But with so many options available, how do you choose the one that's right for you? Here are some factors to consider when choosing a raincoat or waterproof jacket:
The difference between a water-resistant and waterproof jacket
The main difference between a water-resistant and waterproof jacket is the level of protection against water. A water-resistant jacket is designed to protect against light rain or a drizzle, but it's not designed to withstand prolonged exposure to rain or very humid conditions.
On the other hand, a waterproof jacket is designed to protect against more extreme weather conditions, such as prolonged downpours, heavy rain, or even sleet.
If you're looking for a jacket for occasional use and light rains, a water-resistant jacket may be sufficient. However, if you plan to spend a lot of time in very humid environments or under prolonged rain, a waterproof jacket is a more suitable choice for optimal protection.
Waterproofing: what to look for?
The primary purpose of any rain jacket is waterproofing. The jacket's performance relies on the fabric type used, the membrane's inclusion, and the surface treatments applied.
When choosing a jacket, look for a dependable waterproof membrane, which is often enhanced by a Durable Water Repellent (DWR) treatment. This treatment helps water bead on the fabric's surface instead of soaking in.
Keep in mind that the DWR treatment needs to be reactivated periodically to maintain its effectiveness.
2-ply, 2.5-ply or 3-ply? It's all in the construction.
The coat's structure influences its weight, sturdiness, compressibility, and ideal use. Here's how to tell the difference:
| Construction | Description | For whom | Advantages | Limitations |
|---|---|---|---|---|
| 2-ply | Outer fabric + membrane + loose or thin lining | Urban use, light hiking | Comfortable, economical | Less compressible, less technical |
| 2.5 ply | Outer fabric + membrane + protective inner film | Running, cycling, fast hiking | Ultra-light, compact | Slightly less durable |
| 3-ply | Outer fabric + membrane + integrated lining | Mountaineering, long-distance trekking | Durable, performs well in bad weather | A little heavier, more expensive |
Breathability: the art of staying dry... without overheating
A good raincoat not only protects you from rain, but also allows moisture to escape from your body. Otherwise, you'll end up feeling like you're in a sauna!
Breathability refers to the fabric's ability to let sweat, in the form of vapor, escape.
Result: you stay dry inside and out, even when you're on the move.
| ❌ Without breathability | ✅ With breathability |
|---|---|
| Feeling damp, uncomfortable | Long-lasting comfort even when moving |
| Sweat accumulation = rapid cooling | It reduces the sensation of cold after physical activity |
| "Effect of being skin-tight." | A fabric that is comfortable to wear |
Don’t overlook this important detail: ventilation is essential.
Zippers located under the arms (often called pit zips) or openings on the sides. Bring in fresh air Help evacuate excess heat when climbing or cycling Offer greater freedom of movement
How do you read waterproof/breathability ratings?
Have you frequently encountered numbers like 10,000 / 10,000 or 20k / 20k on technical data sheets? This is what they signify, and more importantly, how to interpret them to make an informed decision.
What does 10k/10k means
Impermeability (mm)
This refers to a fabric's ability to block water. The higher the number, the more it can withstand a heavy downpour without getting wet.
Example: 10,000 mm means the fabric can endure a 10-meter water column before letting moisture through.
Breathability (g/m²/24h)
This refers to the fabric's ability to release water vapor produced by your body (sweat). A higher value indicates a reduced sauna effect during exertion.
Example: 10,000 g means 10 liters of sweat can escape per square meter in 24 hours.
Understanding Waterproofing (First element)
| Ratings (mm) | Level of protection | Examples of use |
|---|---|---|
| 5,000 mm (5 k) | Drizzle, light rain | City walking |
| 10,000 mm -15,000 mm (10k-15k) | Moderate rain | 1-day hike |
| 20,000 mm+ (20K+) | Heavy rain, snow | Trekking, skiing, and expeditions |
Understanding breathability (Second element)
| Ratings (g/m²/24h) | Comfort level | Recommended activity |
|---|---|---|
| 5,000 g (5 k) | Basic | Walking, city |
| 10,000 g - 15,000 g (10k-15k) | Very good | Active hiking |
| 20,000 g+ (20K+) | High | Skiing, running, mountaineering |
Finding the right fit is essential for comfort.
A well-fitting raincoat is essential for comfort. If it’s too tight, your movement may be restricted. If it’s too loose, it can catch the wind like a sail and allow rain to get in.
What's best?
A coat that lets you layer a warm layer underneath without being compressed. Sleeves that cover the wrists Adjustable hood that stays in place even in strong winds
Freedom of movement starts with the right fit.
Technical details that make all the difference
A good raincoat involves more than just the fabric; seams and zippers are crucial in providing rain protection.
Sealed seams
Every stitch in a garment can be a potential entry point for water. That's why high-quality waterproof jackets have sealed seams covered with special tape to block water infiltration. The result is that, even in heavy rain, not a single drop gets through.
Waterproof or protected zippers
Zippers are often overlooked but are essential for a raincoat's effectiveness. Without proper protection, water can easily seep through them. The best raincoats feature either laminated waterproof zippers or outer flaps that help divert water away.
Care for your waterproof jacket: enhance its longevity and performance
Your jacket's durability and waterproofing depend on proper care. Dirt, sweat, and oils clog breathable membranes, impair water repellency, and accelerate wear.
Clean 1-2 times a year to:
- Remove residues that impair breathability
- Reactivate the durable water-repellent (DWR) treatment
- Preserve its effectiveness against rain
Follow the manufacturer's instructions.
All waterproof coats are constructed using specific technical materials - membranes, outer fabrics, linings, and water-repellent treatments - that respond differently to washing, drying, and care products.
That's why it's essential to always consult the care label sewn inside your garment.
See our care section.
Complete care with Grangers products
Grangers products are high-quality cleaning and waterproofing solutions that protect and extend the life of your waterproof garments.
Grangers products are designed to clean, protect and waterproof technical garments.
If your coat starts to saturate in the rain or lose its effectiveness, this is normal with time and use.
A good wash with Performance Wash, followed by Performance Repel water-repellent treatment, will revive its breathability and waterproofing, easily and safely.
Don't let the rain put a damper on your adventures. With the right coat, you'll be ready for any weather.
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