An envelope with a window has the advantage that you do not have to print the address for mailing on the envelope. Instead, the recipient is printed in the appropriate place in the letter. This means you are very flexible when using your envelopes with windows and can use them for direct mail, advertising letters, but also for invoices or offer letters. Choose the right format for your envelopes with windows here between different sizes from DIN long to maxi letter, from DIN C4 to DIN C6.