Viewtech is the newest in window design for pressure seal mailers. In the past glassine material has been used for applications that required reverse imaging on simplex printers for C and V fold formats. This glassine material is not sealed at the edges and often creates jamming. Viewtech is a fully laser compatible and laser printable material. We seal the entire perimeter of the window so there are no loose edges to jam. We also round the corners to further eliminate any potential jamming or catching to other sheets. The poly material is totally clear for easy viewing of addresses printed on the sheet as reverse imaging is not used.