Which side of the calendered fabric should face the insulation?

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All our calendered/downproof fabrics will have matte and shiny sides as a product of the calendering process. It is recommended that you put the shiny side towards the insulation (down, Primaloft, etc) and the matte/dull side facing out.

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  • Can you elaborate why it is recommended to have the shiny side facing the insulation? Besides appearance, is there some material property that differentiates the two sides?

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  • to my understanding, the calendered side has a more closed weave do to the heat application slightly fusing the fibers together while pressing on them. I imagine this recommendation is to help prevent insulation from coming through the fabric

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