1.Cotton/Microfiber2.Swings with the Door or Window - Never Bend Again. Our Draft Stopper is build with new material that is design for two purposes to keep the Draft Out and to Stick to Fasteners while the door opens and closes carrying the heavy draft stopper.3.Fits Doors or Windows . If its larger than your door, the draft stopper is flexible enough to bend at 90 degrees.4.Blocks Cold Air from entering or A/C from escaping - The materials in our Draft Stopper were optimized for keeping the cold outside in the winter and A/C inside during the hot summer days.5.Confines Different Odors To Enter/Escape under the door - weather you are smoking in one room or cooking in the other, the odor / smell will have hard time escaping/passing under the door if the Draft Stopper is there.