Double Draft Guard / Stopper to Block Cold Air or Hot Hair From Entering House As Seen on Tv Double Draft Guard - To Prevent Air passage into or out of House / Appartment / Window Blocks Air Leaks on BOth Sides Cold Air stays out and Heat stays in Great Money Saver on Heat & Hydro for Lost Energy due to air leaks & Sleeves are washable Can be Used Interior or Exteriour, The Guard can be Customized by cutting and replacing