INSULATION ALL YEAR LONG: Stay warm during winter months and cool during summer months with this convenient draft blocker for your doors and windows. Our patented design slides under windows and doors to block cold air from entering and prevents cold air from the AC from escaping the house. Made with a durable fabric cover, the sleeve holds foam cylinders on both sides of a door or window to create an airtight seal. GREAT FOR DOORS & WINDOWS: This exterior and interior door sweep can be used under doors or windows. Each stopper is double sided, allowing for extra protection from the cold or heat depending on the season. It features a patented hook-and-loop closure that is adjustable so you can easily fit it under the door. SAVE ENERGY: Dont waste energy trying to warm up a cold house or cool a hot house when theres a draft! Instead, use our efficient door protector.