What Is Waterproof Outerwear?
Last updated 2026-06-15
True waterproof outerwear is distinguished from merely water-resistant garments by its ability to withstand prolonged exposure to pressurized water — measured in millimeters of water column (mm) in laboratory hydrostatic head tests. A garment rated at 10,000mm or above is considered waterproof for most conditions, while 20,000mm+ handles heavy sustained rain and wet snow. This waterproofing is achieved through three primary technologies: membrane laminates (Gore-Tex, eVent, Sympatex) that bond a microporous or monolithic waterproof-breathable layer to the face fabric; polyurethane coatings applied to the fabric interior; and fully welded or taped seams that prevent water from wicking through stitch holes. The critical tradeoff in waterproof outerwear is waterproofing versus breathability — a completely sealed garment traps body moisture and perspiration inside, creating internal wetness that can be as uncomfortable as external rain. Modern membrane technologies address this by allowing water vapor molecules (perspiration) to pass outward while blocking larger liquid water molecules from entering. When selecting waterproof outerwear, consider both the waterproofing rating and the breathability rating (also measured in grams per square meter per 24 hours), as well as whether the garment suits your activity level.
When coastal photographer Tomás analyzed why he was consistently damp during ocean-side shoots despite wearing a jacket labeled 'waterproof,' he discovered his budget rain shell had only 5,000mm waterproofing and no sealed seams — technically water-resistant but inadequate for the wind-driven rain of coastal cliffs. Upgrading to a Gore-Tex Pro shell with fully taped seams and 28,000mm waterproofing transformed his shooting sessions: four hours of horizontal rain and sea spray left his layers underneath completely dry, and the jacket's breathability prevented the clammy interior he had experienced with cheaper coated shells during active hiking to shooting locations.
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Questions, answered.
What is the difference between waterproof and water-resistant?
Water-resistant and waterproof represent fundamentally different levels of protection. Water-resistant fabrics are treated with a DWR (Durable Water Repellent) coating that causes water to bead and roll off the surface in light rain and brief exposure, but will eventually soak through in sustained rain or under pressure (like a backpack strap pressing wet fabric against your shoulder). Water-resistant garments typically lack sealed seams, meaning water can penetrate through the thousands of needle holes where fabric pieces are stitched together. Waterproof garments, by contrast, use a membrane or coating that creates a complete barrier against liquid water, combined with sealed or taped seams that prevent penetration at stitch points. A waterproof garment can withstand hours of heavy rain without leaking. The practical test: if you can sit on wet ground or stand in pouring rain for an extended period and remain dry, the garment is truly waterproof.
How do you maintain waterproof outerwear?
Maintaining waterproof outerwear involves two key practices: regular washing and periodic DWR reapplication. Washing is actually essential — dirt, body oils, and sunscreen clog the membrane's pores and reduce breathability, and contaminate the DWR coating causing water to sheet rather than bead. Wash with a technical fabric wash (Nikwax Tech Wash or Granger's Performance Wash) on a gentle cycle, rinse thoroughly, and tumble dry on low heat for 20 minutes — the heat helps reactivate the DWR coating. When you notice water no longer beading on the surface even after washing (it soaks in and darkens the fabric instead), apply a spray-on or wash-in DWR treatment like Nikwax TX.Direct. Avoid fabric softeners, bleach, and standard detergents, all of which damage waterproof membranes. Store waterproof jackets loosely hung rather than compressed, as prolonged compression can damage the membrane layer.