Materials
Water-resistant, waterproof, and what the label is not telling you
Three words, three very different afternoons.
A water-resistant shell has a durable water repellent finish on the outside of the face fabric. Rain beads and rolls off. It handles a shower, a commute, an hour of drizzle. It does not handle four hours on an exposed ridge, and it was never built to.
A waterproof shell adds a membrane laminated behind the face fabric, with taped seams. That is what keeps water out under sustained pressure — rain driven by wind, or the pressure of a pack strap on a wet shoulder. It is heavier, less breathable and considerably more expensive.
Both of them fail the same way, and it is almost never the membrane. The DWR finish on the outer face wears off with abrasion and with dirt. Once the face fabric soaks through, the jacket 'wets out': you stay dry from the rain but you get cold and clammy, because a saturated face fabric stops the membrane breathing. People read that as a leak. It is not.
The fix is unglamorous. Wash the shell — yes, wash it — with a technical wash, not detergent, then tumble it warm or press it with a low iron through a cloth to reactivate the finish. Reproof once or twice a season. A five-year-old shell that is washed and reproofed outperforms a one-year-old shell that never is.
We describe our outerwear as water-resistant because that is what it is. Where a piece carries a membrane we say so on the product page, with the seam treatment.
Written by the Ultramax USA team. This is general information about footwear and clothing, not medical advice — see our legal notice.