The Frost King Indoor Window Insulation Kit (4-Pack) provides shrink film and tape to insulate 4 standard sized windows. Shrink film on windows helps increase their R-Values up to 90%. This provides energy-saving efficiency. Shrink Windows also stops drafts.. Builders Hardware Product Type: Foam Tape. Color Family: Clear. Color/Finish: Clear. Density: 4.0. Interior/Exterior: Interior. Location Type: Windows. Material: Plastic. Returnable: 90-Day. Product Depth (in.): .0025 in. Product Height (in.): 42.00 in. Product Width (in.): 62.00 in. Unspooled Length (ft.): 5. Unspooled Length (ft.): 5. Location Type: Windows. Interior/Exterior: Interior. Material: Plastic. Builders Hardware Product Type: Foam Tape