Skin package with transparent back window

A method of making a skin package enclosing a product for display and sale, said method comprising:

• A. providing a flat air permeable backing sheet having a front face and a back face,
• B. applying a thin adhesion-promoting transparent coating of thermoplastic resinous material continuously over the front face of the sheet,
• C. cutting an opening in the sheet,
• D. applying a first transparent precut window film covering said opening over the front face of the sheet,
• E. placing a product to be packaged over said window film,
• F. applying a further protective transparent heat softened transparent skin film over said backing sheet and product,
• G. while still heat softened, applying suction to the back face of said sheet to draw said skin film down over said product and to heat seal said skin film to the adhesion-promoting coating and backing sheet,
• H. cooling the package to stabilize the skin film,
• I. said transparent window film being substantially air impermeable and the area of said film being greater than that of the opening but substantially less than that of the backing sheet, whereby at least a portion of the front face of the backing sheet around the opening is uncovered by the window film.