Frost King brand double draft stop simultaneously insulates both the inside and outside of door or window. Eliminates drafts and dust traveling through gap underneath door or window. Works on carpeted or hardwood floors. Durable and safe foam insulating rods secure the washable cover. Easy and quick installation. No tools necessary. Fits doors and windows up to 36" wide and can easily adjust to fit a door or window less than 36" wide. Use any time of year to save money by saving energy.