Quick Answer
Shell Layers: Waterproof Materials Compromise Breathability: Yes, waterproof materials can compromise breathability, but the extent of the compromise depends on the specific type of waterproof coating, thickness, and construction of the material.
Breathability Compromise
Waterproof materials often compromise breathability due to the presence of a waterproof coating, which can impede moisture transfer through the fabric. For example, Gore-Tex’s waterproof and breathable membrane has a permeability rating of 20,000-30,000 g/m²/24hr, but this can be compromised by the use of thick or heavy coatings. In contrast, eVent’s waterproof coating has a rating of 20,000-40,000 g/m²/24hr and is considered more breathable than Gore-Tex.
Shell Layer Construction
The construction of the shell layer can also impact breathability. A shell layer with a single layer of waterproof material is less breathable than one with multiple layers of lightweight, breathable materials separated by a waterproof membrane. For example, a shell layer with a 2-layer construction (e.g., Gore-Tex Paclite) is more breathable than a shell layer with a 1-layer construction (e.g., single layer of waterproof nylon).
Breathability Enhancements
To enhance breathability in shell layers, manufacturers can employ techniques such as mesh panels, ventilation systems, and treated fabrics with breathable coatings. Mesh panels can provide up to 40% more ventilation than solid panels, while ventilation systems, such as pit zips and adjustable cuffs, can allow for controlled airflow. Treated fabrics with breathable coatings, such as eVent’s eVent PowerShield, can provide improved breathability while maintaining waterproof performance.
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