Spunbond Nonwoven Fabrics is a fabric like material made from long fibers, bonded together by hot-press. They are flat, porous sheets that are made directly from separate fibers or from molten plastic or plastic film. They are not made by weaving or knitting and do not require converting the fibers to yarn. The term is used in the textile manufacturing industry to denote fabrics, such as felt, which are neither woven nor knitted. Non-woven materials typically lack strength unless densified or reinforced by a backing.

SMS is the abbreviation of "Spunbond + Meltblown + Spunbond Nonwovens", that is a combined nonwoven fabric which two layer spunbond have been combined with one layer meltblown nonwovens inside, conforming them into a layered products, called SMS nonwoven fabrice (spun-melt-spun), if combined with two layer meltblown nonwoven inside, it's called SMMS nonwoven fabric (spun-melt-melt-spun), in the same way, combined with three layer meltblown nonwoven inside, it's called SMMMS nonwoven fabric (spun-melt-melt-melt-spun).