An extensible laminar material 100 includes an extensible layer 106 coupled to at least one laminar layer 102, 104. The extension of the extensible layer 106 starting from a non-extended condition determines the extension of the laminar layer(s) 102, 104 while the return of the extensible layer 106 toward the non-extended condition determines the pulling of the laminar layer(s) 102, 104 into a wrinkled condition. The extensible layer 106 and at least one laminar layer 102, 104 are connected by welding to avoid their detachment. The extensible layer 106 is anchored to at least one laminar layer 102, 104 by lines of spread adhesive 108, 108′. The welded connection is absent in correspondence of the lines of spread adhesive 108, 108′. Preferably, the material is in the form of a web 100 extensible transversally to the longitudinal extension of the web with the lines of spread adhesive 108, 108′ extending along the sides of the web.