ergoPouch White Window Blockout. Re-usable Static-Cling Sheets, Block 100% of Sunlight. Easy to Cut, Peel and Apply to Window. Reuse Multiple Times (White) (3 Rolls) The reusable static-cling Window Blockout is the perfect solution for babies and toddlers who need total darkness to sleep. The blockout is white on both sides to seamlessly blend into your nursery. It both blocks out light and reflects light away from windows, helping to regulate the room temperature for a more comfortable sleep.