be used depending upon the circumstances involved the method described results in an altered topography and permeability of the resulting fabric a pattern similar to the pattern of the embossing roll will be transferred to the fabric this pattern may stem from in plane deformation where the nominal caliper of the fabric remains constant and areas comprising the pattern are compressed in this situation the fabric has a patterned side and a smooth side the pattern could also result from out of plane deformation where the nominal fabric caliper has increased due to physical movement of material out of the original plane of the fabric in this situation the pattern exists on both sides with one side consisting of a protuberance with a corresponding cavity on the opposite side in this situation compression may or may not occur changes in permeability to fluid air and water of the fabric can be affected by carefully controlling the amount of compression in the patterned areas high temperatures and pressures could ultimately result in fusion of the fibers in the embossed areas completely sealing the areas this would result in a u201c perm no perm u201d situation compression to varying degrees without fusion could result in a situation where the permeability of the fabric in the embossed areas is less than the original permeability but not reduced to.