Any boy who loves football will love these kids birthday invitations that you can personalize with his team colors! Kids love to see their names on a jersey, and these birthday invitations let you put the birthday boy's name on the front and back, and change the numbers on the jersey to his birthday year. All the text is editable, with plenty of room on the back for all the party details you need to add. Because these are square shaped when finished, square envelopes are included but they do require additional postage to mail. You also have the option to choose rectangular envelopes, which do not require extra postage and have a pocket inside to hold square-shaped cards without shifting.