A rain shell, often referred to as a rain jacket, is a type of outerwear designed specifically to protect the wearer from rain and wet weather. It serves as a lightweight, waterproof layer that is typically worn over other clothing.
Based on the provided reference comparing hardshells and rain jackets, rain shells (or rain jackets) are constructed with the primary goal of offering waterproof and breathable protection in a less bulky and often more affordable package than traditional hardshells.
Here's a breakdown of what defines a rain shell:
- Construction: Unlike the more robust 3-layer construction often found in hardshells, rain jackets typically use 2 or 2.5 layers of fabric. This layering choice is often made in order to cut cost and weight, making them lighter and more packable.
- 2-Layer: The outer face fabric is bonded to a waterproof/breathable membrane. A separate, often mesh or fabric liner is added on the inside to protect the membrane and provide comfort.
- 2.5-Layer: The outer face fabric is bonded to a waterproof/breathable membrane. Instead of a full fabric liner, a printed or sprayed-on protective layer is applied to the inside of the membrane. This saves weight and bulk compared to 2-layer construction but can sometimes feel clammy against the skin.
- Key Components & Features:
- Outer Fabric: Generally made from nylon or polyester, this layer provides abrasion resistance and is treated to shed water.
- Waterproof/Breathable Membrane: Bonded to the outer fabric, this layer prevents liquid water from entering while allowing water vapor (sweat) to escape, helping you stay dry from the inside out.
- DWR Finish: A Durable Water Repellent coating applied to the exterior fabric causes water to bead up and roll off, preventing the fabric from becoming saturated.
- Sealed Seams: All seams are taped or sealed to prevent water from leaking through the needle holes created during construction.
- Purpose: Designed for general wet weather use, travel, hiking, or everyday wear where lightweight, packable, and effective rain protection is needed without the heavy-duty durability or features of a full hardshell.
In summary, a rain shell prioritizes a balance of waterproof protection, breathability, low weight, and packability, often utilizing a 2 or 2.5-layer construction which differentiates it from the 3-layer design commonly found in hardshells. This construction choice is often driven by the desire to reduce both cost and overall jacket weight.
For more information on the differences between these types of jackets, you can refer to resources like the Hardshells vs. Rain Jackets guide by Switchback Travel.
