This is a non window return reply envelope designed to work with ProBill software. The intent of this envelope is to include it with the outgoing double window envelope, for the purpose of your client using it to return their payment stub with payment to you. You simply fold this envelope in half and place it into the double window envelope when you sent the client their statement.
The top left corner of the envelope is designed for your client to write their address, so you can make sure their mailing address is updated in your database. The center of the envelope has your address pre-printed on it, so that the envelope is mailed to you without issue. The stock is made from a heavy 24 pound white wove paper stock.