Abstract A METHOD FOR THE MANUFACTURE OF RELATIVELY THIN PIECES USEFUL IN THE MAKING OF COMPONENTS FOR SHOES, MOROCCO ARTICLES AND OTHER SIMILAR ARTICLES. A MOLD IS PREPARED BY CATING THE ARTICLE IN A MOLD OF SILICONE CONTAINING MATERIAL WHICH HAS LOW DIELECTRIC LOSSES. A SHEET OF ABSORBENT MATERIAL SUCH AS PVC FOAM IS IMPREGNATED WITH A PASTRY OR PULVERULENT PLASTIC MATERIAL OF THE SAME CHEMICAL NATURE AS SAID SHEET AND HAVING A HIGH COEFFICIENT OF DIELECTRIC LOSSES. ON OR BELOW SAID PLASTIC-IMPREGNATED SHEET IS DISPOSED A SUPPORTING SHEET OF LEATHER, TEXTILE OR OTHER SUITABLE MATERIAL. A CLOSE MUTUAL BONDING OF THESE ELEMENTS IS INSURE BY THE COMBINED ACTION OF COMPRESSION AND THE APLICATION OF HIGH FREQUENCY CURRENTS FOR GELLING AND MELTING THE PLASTIC MATERIALS OF SAID SHEET AND SAID PASTRY OR PULVERULENT PLASTIC MATERIAL, THUS CAUSING THE COMPLETE DISAPPEARANCE OF SAID SHEET OF ABSORBENT MATERIAL.