“Fully waterproof zip” is one of those phrases that shows up on spec sheets constantly and rarely gets questioned. It’s worth questioning.
Most of what gets marketed as a waterproof zip is, technically, water-resistant. The common construction is a coil zip with a polyurethane film laminated to the back and DWR treatment on top, which does a genuinely good job of shedding water and keeping the zip from being a weak point in wet weather. What it isn’t, in most cases, is a sealed, watertight barrier. That’s not a flaw. It’s just a different, more accurate word than the one usually printed on the box.
Why the distinction actually matters
It’s not really about catching anyone out. A water-resistant zip that’s well specified and properly installed will do its job in the rain and wind conditions most of us actually camp in. The problem is when “waterproof” gets used loosely enough that buyers start expecting a fully sealed product, and then feel let down when water gets through under sustained, heavy exposure that a water-resistant component was never rated for in the first place. Honest naming sets the right expectation. Inflated naming sets you up to be disappointed by a component that was doing exactly what it was built to do.
Construction matters as much as the component
The same goes for welded or taped seams. A high-spec zip or tape stitched into a poorly matched seam allowance underperforms its own rating, because water resistance is a system property, not just a component you bolt on. A premium zip in a budget build is, in practice, a wasted upgrade. If a spec sheet leads with the component name and says nothing about the construction around it, that’s a gap worth noticing.
Hardware weight-shaving is real, but check what it costs
Skeletonised buckles, contoured ladder-locks and lighter webbing are genuine, incremental weight savings, and mostly fine. The thing worth checking before assuming it’s a free upgrade is whether the load-bearing capacity has actually been tested at the lighter spec, or whether it’s just thinner because thinner is lighter. Not every gram saved on hardware is neutral, some of it is genuinely engineered, some of it is just less material.
What we’d rather do
Say what a component actually does, not the version of the claim that sounds best on a spec sheet. Water-resistant is a real, useful standard. So is waterproof, when it’s actually true. They’re not the same claim, and treating them as interchangeable is exactly the kind of small dishonesty that adds up across an entire industry’s spec sheets.
Over and Out