Downproofness of Fabric
• Air Permeability Air permeability describes breathability
of the fabric & may indicate downproofness.
• Downproofness Physical tumbling of the fabric filled with
down/feathers determine downproofness.
The next most common source of the leakage is through the
fabric itself. Heavy, coated fabrics are almost always very
down-proof whereas, very lightweight synthetic fabrics
and damask & other patterned cotton fabrics allow more
material to pass through.
• Downproofness (FSTM 191-5530 & EN 12132-1).
This involves physically testing the fabric to simulate the
use of the product.