04.05.11
Patented recently is an invention that relates to a spun-bonded nonwoven fabric made of polyolefin filaments having a titer less than 1.6 dtex, the spun-bonded nonwoven fabric having a basis weight.ltoreq.18 gsm.sup.2, a waterproofness of less than 15 cm measured as a water column, and an air permeability of at least 230 m.sup.3/(m.sup.2min), wherein the product of the air permeability and the basis weight is .ltoreq.5000 g/(mmin).