Designed specifically for two-up style W-2 forms, Adams W-2 Envelopes provide a precise fit, so that you can professionally satisfy your tax-season obligations. Interior security pattern & blue tinting help to ensure that all confidential information remains obscured during transit. Left-aligned double-windows allow only the employer's & employee's addresses on the form to clearly show through. Each envelope is constructed of woven-finish business-weight paper & features a cost-effective gummed closure, making them ideal for bulk mailings. To help your employees properly identify the nature of your correspondence, “Important Tax Return Document Enclosed” is also pre-printed on each envelope's face. Seam Type: Side; Flap Type: Commercial; Security Tinted: Yes; Opening: Open Side.