This density sponge window seal improves energy efficiency and comfort by blocking air leakage and stabilizing indoor temperature. sealing: blocks air leakage, reduces energy consumption, and keeps indoor temperature steady for reliable comfort. Broad compatibility: suitable for casement and roof windows, fitting a range of designs in homes and workplaces. Easy installation: peelandstick design requires no tools; quick to apply and easy to remove when needed. Durable and reliable: made from density sponge material that resists compression and maintains performance across temperature changes. Size options: available in multiple widths to fit common window gaps. Practical scenarios Residential living rooms with casement windows to reduce drafts and improve AC/heater efficiency. Attic or loft spaces with roof windows to minimize heat transfer and seasonal energy use. Small offices or workshops with mixed window types to support HVAC performance without complex installation.