Most insulation layer materials are polyester with treated fibres which allow the fibres to entice air in between them. These materials are fleece, bunting, or pile. Fleece is a kind of polyester that is densely knit. A napping machine threads cloth loops resulting to a tight solid weave on one facet and a fluffy surface on the opposite that retains air. Bunting and pile materials are additionally fleece, but bunting is napped at either side to create a stable weave while pile undergoes one other set of napping for a thicker material.
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