'Down proof" ?
Only known by testing.
Some suppliers will specify they know a fabric is down-proof, and sometimes only for down of specified quality, or they may say they don't know. At least one supplier is explicit that down proof does NOT mean synthetic insulation will not poke through, and that is the responsibility of the buyer to confirm the fabric has the properties of insulation resistance for the specific insulation for garments. IOW: No blanket statements. <pun>
Calendering is one process used to seal and put a shine on fabric, and it is associated with down-proofing, but it doesn't guarantee it.
Last edited by DemostiX; 09-23-2012 at 01:46..