TOPS® W-2 Envelopes fit your W-2 forms for the Social Security Administration. TOPS® tax envelopes have a security tint and pattern to obscure confidential information. Double windows fit W-2 forms precisely so private information stays concealed. A peel & seal closure saves you time. Preprinted with "Important Tax Return Document Enclosed." Seam Type: Side; Flap Type: Commercial; Security Tinted: Yes; Opening: Open Side.