Specially developed 3M tape and film system for outdoor use. Clear-as-glass insulating film installs easily from the outside. Stretches drum tight and wrinkle- free. Fights air infiltration and adds an extra pane of insulation, preventing frosty windows. Special weather-resistant double stick tape included. No. 2173W-6: 3 pack film, 62'' x 126'' No. 2174W-6: Patio door kit, film 84'' x 112''