Glossary term
MVTR
Also known as: Moisture Vapor Transmission Rate
A measure of how much water vapour can pass through a fabric per square metre per day — a proxy for breathability.
Definition
MVTR (typically g/m²/24h) quantifies how quickly water vapour moves through a laminate.
Higher MVTR means sweat escapes more quickly, reducing condensation inside the garment.
Why it matters to DSEAMS
DSEAMS bonded seams do not compromise the base laminate's MVTR across seam lines — a contrast with tape-sealed seams where local breathability drops wherever tape is applied.
Related terms
- Waterproof-breathableA fabric construction that blocks liquid water from entering while allowing water vapour to pass through — enabling sweat to escape from a sealed garment.
- Barrier membraneThe thin functional layer inside a laminate that blocks liquid water while allowing vapour to pass.
- BreathabilityThe ability of a garment or fabric to move water vapour from inside to outside — critical to wearer comfort during high-exertion use.