I just listed a small quantity of Twin Draft Guards. These things are AMAZING! They work simply by housing a pair of foam tubes in a cover and sliding the cover under a door, or a widow. The result is a "twin" draft guard - or in other words, a pair of foam tubes held snugly on opposite side of the bottom of a door or window. The result is worth every penny, as the guards block both drafts and noise, creating an insulation that makes your home more energy efficient, and both your wallet and your ears more comfortable! These amazing draft guards work on both exterior and interior doors (& windows), easily glide over all floors - carpet, wood, tile, and linoleum, and fit neatly into a durable, machine washable cover! You can lower your heating and cooling bills by ordering one of these draft guards today!