Ensuring that all of your letters arrive in style q connect white window envelopes are perfect for all businesses with a peel and seal closure contents remain secure in transit the window on this envelope allows a printed name and address to be shown saving you printing separate address labels the dl sized envelope 110 x 220mm is perfect for a4 documents that have been folded into thirds white envelope for mailing window dimensions 35x89mm window position 19mm in 18mm up 90gsm for p