Waterproof, water-resistant, DWR, hydrostatic head — here is what these terms actually mean and what matters for Australian conditions.
The Short Version
Nothing is truly waterproof forever. Every waterproof membrane eventually wets out given enough pressure or enough time without care.
Water-Resistant
A fabric that repels light moisture — a brief shower or splash. The fabric itself resists water absorption without any membrane. It will not keep you dry in sustained rain.
DWR (Durable Water Repellency)
A chemical treatment applied to the outer face of waterproof membranes. DWR causes water to bead and roll off the surface. When DWR wears off — after 20–30 wash cycles — water soaks into the face fabric and dramatically reduces breathability. You can restore DWR with Nikwax, Grangers, or similar products.
Waterproof — Hydrostatic Head
The waterproof rating measured in millimetres of hydrostatic head:
1,500–5,000mm: Light rain only.
5,000–10,000mm: Moderate rain.
10,000–20,000mm: Heavy sustained rain — what serious outdoor people need.
20,000mm+: Alpine or offshore conditions.
Seam Sealing
A membrane rated at 20,000mm is useless if the seams are not sealed. Fully taped seams seal every seam; critically taped seams seal only stressed areas. For Australian wet-weather use, fully taped seams are worth the premium.
Every jacket in our outerwear range lists its waterproof rating and seam construction clearly.
