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| Field | Why it matters |
|---|---|
| Composition | Ask whether the cloth is coated, laminated, or densely woven, and whether seams will be taped. |
| Mass / construction | Shell cloths vary. Do not guess millimetres of water column unless the page publishes a test. |
| Care | Some finishes decline after wash. Follow the mill aftercare. |
| Sample | If a water test is claimed, ask how it was measured. A splash on a swatch is not a hydrostatic test. |
| Common miss | Calling a DWR finish waterproof without a published barrier. |
Does every waterproof fabric listing mean the same cloth?
No. Waterproof fabric resists liquid water under the conditions the mill names. Water-resistant is a weaker claim. Ask whether the cloth is coated, laminated, or densely woven, and whether seams will be taped.
Can you skip sampling waterproof fabric?
If a water test is claimed, ask how it was measured. A splash on a swatch is not a hydrostatic test.
What should stay on the brief besides the keyword waterproof fabric?
Barrier type, seams, weight, and any published water test. Calling a DWR finish waterproof without a published barrier.
