Self mailers can have a window die cut out of
a panel to expose the delivery address that has been printed on another panel.
An example of a self mailer with a window die cut is shown in the illustration
above. Using a window die cut will sometimes eliminate the need to imprint both
sides of the mailer. Be cautious in using a die cut window on your mailer because
not all folder/sealers can run them. Some window die cuts can have a patch added
to the window but you may be limited to what type of patch can be used. Adding
a window die cut is a feature that should be discussed with the individuals
that will be responsible for folding and sealing your mailer. Find out what
the capabilities of the folder/sealer are before designing your mailer with
a window die cut.