Shrink and seal indoor window kit is installed around entire window to eliminate cold air drafts and frost build-up. Crystal clear film that is easy to install with a hair dryer that shrinks tight and wrinkle free. Creates dead air space to increase insulating R-Value up to 90 percent. Brand Name: M-D Sub Brand: Polar Block Color: Clear Design: 3-Window Indoor or Outdoor: Indoor Product Type: Insulation Kit Width: 42 in. Length: 62 in. Thickness: 0.