When selecting a jacket to keep you dry during wet conditions, it’s essential to understand the various waterproofing methods and technologies available. This knowledge ensures you choose a garment that meets your specific needs, whether you’re facing a light drizzle or a heavy downpour.

Types of Waterproof Jackets

Waterproof jackets are categorized based on their construction and the level of protection they offer:

• 2-Layer Waterproof Jackets: $
  These jackets feature an outer shell bonded to a waterproof membrane, with a separate inner lining, often made of mesh or polyester taffeta. The inner lining protects the waterproof membrane from wear and tear caused by friction and sweat. This construction is common and provides a balance between protection and comfort.
• 2.5-Layer Waterproof Jackets: $$
  In this design, a thin polyurethane coating is applied over the inner side of the waterproof membrane, eliminating the need for a separate lining. This makes the jacket lighter and more packable, suitable for activities where weight and space are considerations.
• 3-Layer Waterproof Jackets: $$$+
  These jackets consist of an outer shell, a waterproof membrane, and an inner lining, all bonded together. This construction offers enhanced durability and is designed for prolonged exposure to harsh weather conditions, making it ideal for intense outdoor activities.

Waterproof Ratings

Waterproof ratings indicate a fabric’s ability to withstand water pressure, measured in millimeters (mm). A higher number signifies greater resistance to water penetration.

• 5,000mm to 10,000mm: $ - $$
  Suitable for moderate rain and average conditions. Jackets in this range are often more affordable, catering to occasional casual use. 
• 10,000mm to 20,000mm: $$ - $$$
  Ideal for heavy rain and more demanding conditions. These jackets typically come at a mid-range price point, balancing performance and cost.
• 20,000mm and above: $$$+
  Designed for extreme weather and prolonged exposure to heavy rain. Jackets with these ratings are usually professional-grade products, reflecting their advanced protection capabilities.

Seam Sealing

Seams are potential weak points where water can seep through. To prevent this, jackets employ seam-sealing techniques:

• Fully Seam-Sealed: $
  All seams are sealed, offering maximum waterproof protection.
• Critically Seam-Sealed: $$+
  Only the most exposed seams are sealed, providing adequate protection for less extreme conditions.

Fully seam-sealed jackets are more waterproof than critically seam-sealed ones.

Zippers

Zippers play a crucial role in a rain jacket’s overall water resistance. Many high-performance jackets use waterproof zippers, which are typically coated with polyurethane to block moisture and eliminate the need for a storm flap. These zippers provide a sleek, low-profile look but can also make jackets more expensive due to their specialized construction. While waterproof zippers enhance protection, they aren’t always necessary—many jackets use non-waterproof zippers combined with additional design elements to effectively keep water out.

While waterproof zippers offer enhanced protection, they aren’t always foolproof against heavy rain. To improve water resistance in jackets with non-waterproof zippers, several garment construction techniques can be employed. Storm flaps—fabric overlays that shield the zipper—create a barrier against water ingress, while reverse coil zippers present a smoother, more resistant surface. Additionally, an internal rain channel—a strip of fabric sewn behind the zipper—helps divert any water that seeps through, directing it away from the wearer and toward the hem. Pairing these techniques with sealed seams ensures optimal waterproof performance, even without a fully waterproof zipper.

Breathability

While keeping water out, it’s also important for a jacket to allow moisture from sweat to escape. Breathable fabrics prevent the buildup of condensation inside the jacket, enhancing comfort during physical activities. New highly technical fabrics are designed to provide this balance between waterproofing and breathability.

Choosing a Rain Jacket

Understanding the different types of waterproofing technologies and jacket constructions empowers you to make an informed choice tailored to your activities and the weather conditions you expect to face. Whether you’re an avid hiker, a daily commuter, or someone who enjoys outdoor adventures, selecting the right waterproof jacket is crucial for comfort and protection.

Like anything else, you typically get what you pay for. A 2-Layer, 5,000mm rated jacket with minimal or no seam sealing is most likely going to be cheap and will not do the job very well or very long.  Conversely, a 3-layer, 20,000mm+, fully seam sealed, with a top of the line waterproof zipper can be well over $500 but will last a long time and keep you dry in any weather.

The key is to find the right jacket that works for your purposes and your budget.  Do you need one to keep in the car in case of emergency and may get used a hand full of times ever - or are you looking for one that you'll wear everyday giving behind the scene tours of waterfalls?

Constant Mountain’s Infinity Pocket Rain Jacket

The Men’s Infinity Pocket Rain Jacket by Constant Mountain exemplifies advanced waterproofing technology. Crafted with high-quality waterproof polyester woven fabric, it boasts a 10K waterproof rating and is fully seam sealed, ensuring you stay dry even in intense rainstorms. This 2.5-layer jacket offers a luxurious hand feel that isn’t crunchy, providing comfort without compromising on performance. The patented Infinity Pocket is lined with a soft, velvety interior that provides maximum comfort while the practical Secure Pockets protect your stuff from the elements. It offers a perfect blend of performance, comfort, and value for your everyday climb.