Energy efficiency products such as home sealing and insulation products from M-D Building Products provide the quickest and easiest return on investment for your home or business. These envelope sealing products lead the industry in both utility and style. Vinyl clad weatherstrip installs into the kerf slot in the door jamb. Flexible weatherstrip that can be shaped to fit around doors and windowsAll season protection against drafts, moisture, dust and insectsU.L. Rated