Abstract: A ribbed tick comprising a top sheet and a bottom sheet connected at their edges and at least one ribbon-shaped partition wall connected to the inner sides of the top and bottom sheets by welded seams extending along the longitudinal edges of said partition wall.A method of preparing a ribbed tick comprising the steps of placing a ribbon having tapes of a thermoplastic film material located at its longitudinal edges between a top sheet and a bottom sheet material, heating said tapes to melt said thermoplastic film material and to bond the ribbon to said top and bottom sheet materials and connecting said top and bottom sheet materials to form a ribbed tick having ducts for a stuffing material.