Even if your jacket once kept you dry, it probably hasn’t “failed” overnight. Years of wear, exposure to oils, dirt, sunscreen, and abrasion slowly degrade its protective layers.
How rain jackets work:
Most jackets have a waterproof membrane (like Gore-Tex) with microscopic pores that block liquid water but let sweat vapor escape.
The outer fabric is treated with a Durable Water Repellent (DWR) finish, which makes water bead and roll off.
Older DWRs used PFAS (“forever chemicals”), now largely replaced by silicone or hydrocarbon alternatives for safety and environmental reasons.
Common issues over time:
The chemical finish wears off due to rubbing, sun, and contaminants.
Body oils, sunscreen, and insect repellents can clog membrane pores.
Membranes can thin or develop cracks, and seam tapes may peel.
Maintaining waterproofing:
Gentle washing with a cleaner made for waterproof fabrics, avoiding harsh detergents and fabric softeners.
Reapply DWR using spray-on or wash-in products if needed.
Re-activate the finish with low heat (dryer or iron) for certain fabrics.
Avoid storing wet jackets scrunched up for long periods.
Proper care extends the jacket’s life, keeps you dry, and reduces environmental impact by delaying the need for new technical fabrics.
