Abstract: Preparation of a non-woven web of fibrous material so as to obtain a product having considerably better mechanical characteristics than the "breathable" non-woven fabrics of the prior art, without any substantial loss of its softness, drape or porosity characteristics. A starting needle punched non-woven web consisting substantially of thermoplastic synthetic fibers is subjected to pulsating sharp blow mechanical pressure applied transversely to web surface sufficient to generate heat by inter-fiber friction and deformation work subjected on the fibers to increase the temperature of fibers to soften them and bring the fibers tightly to adhere one with another and lock together because of the non-regular shape of fiber surface and cross section caused by said treatment. Simultaneously the interstices between the fibers are reduced and the web is compacted resulting in a relatively close natural leather-like non-woven fabric.