Hayden Blackout Roller ShadeBring darkness and comfort to any space with our thermal blackout roller shades.Thermal backing for excellent blackout propertiesBuilt-in Cassette valanceStreet side is white for neutral exterior appearanceCassette Valance measures to the size ordered, fabric of shade will measure approx. 1″ narrower (i.e a shade ordered at 23″ will measure 23″ at the top but fabric will measure approx. 22″)Included mounting hardware allows for either inside or outside mounting. Easily adjusts to the exact length you require with center holder on bottom rail. Window must be at least 2-1/4″ deep for inside mount, 2-5/8″ deep for inside flush mount. Polyester with thermal backing. Vacuum or spot clean. Installation instructions and hardware included. Shades may require adjustment to the tension mechanism in the headrail to adjust the speed of shade retraction.