Material technology profile

Windproof

Stops airflow passing through the cloth, so wind cannot strip body heat away. There are two routes: weave the fabric tight enough, or bond a membrane between layers. The woven route stays light, soft and packable; the membrane route blocks more completely and brings waterproofing with it

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How it works

Stopping wind between the yarns

Wind does not pass through fibre, it finds the gaps between yarns. Finer yarns let more threads sit in the same width, raising thread count and shrinking those gaps until airflow struggles through; a calendering pass presses the surface tighter still and closes it enough to hold down fill in. In laminated builds the membrane blocks airflow outright — the most complete barrier, at the cost of thickness and packability

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Performance Profile

Evidence-led proof points explain what this material technology delivers. Values depend on construction and verified testing.

01 High-Density Weave

High-Density Weave

Wind does not pass through fibre, it finds the gaps between yarns. Fine-denier yarns pack more threads into the same width until those gaps are too small for airflow, which is how a 42 g/m² cloth blocks wind at all. Because the barrier is the weave and not a membrane, the fabric stays soft, breathable and packable

02 Light and Packable

Light and Packable

No membrane, no bonded layers — a single woven ply that compresses down to almost nothing and can live permanently in a pack. The same calendering that tightens the face also closes it enough to hold down fill, which is why fabrics like this often end up as the shell of a lightweight down piece

Moisture vapour transmission (by fabric): 10,000–20,000 g/m²·24h

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Performance may vary by fabric and construction. Confirm values against approved test documentation.

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