The backing cloth with spinning interlining is made of yarn or filament by a certain process or means (usually with knitting, 30D, 50D, 75D, 150D, etc.); the backing cloth of non-woven interlining is also called non-woven cloth, as the name implies, it is not "woven" out of cloth, it is a direct use of high polymer chips, staple fibers or filaments. Non-woven fabrics are formed by air flow or mechanical meshing, then spunlaced, needled, or hot-rolled, and finally finished. Non-woven interlining will rot out if you pull it by hand with a little force, but not if you have one. Usually, non-woven interlining is inexpensive.
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