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 product. The resulting composite fabric has excellent physical properties (strength, elasticity, abrasion, secondary tearing, tear strength etc.) and excellent barrier qualities preventing leakage of very fine particles and micro-organisms and aggressive liquid.