Purpose and key benefit Creates a dependable sealed barrier that improves cooling and heating performance by preventing cold air loss and blocking warm air entry. Ideal when you need stable indoor temperatures and lower energy use. Performance and function Enhanced thermal insulation reduces heat transfer through the window area so air conditioning and heating systems work more efficiently. Waterproof fabric reduces heat penetration, resists weather exposure, and helps keep the interior dry. UV-protected material increases durability and maintains performance over time. Compatibility and sizing Designed to fit inward- and outward-opening windows. Works with single-vent or double-vent setups. Accommodates total window perimeters up to 300 cm — verify your window dimensions before installation. Material and durability Sealing kit uses a robust waterproof fabric that withstands outdoor exposure and limits moisture intrusion. UV protection on the material reduces sun damage and prolongs service life. Easy installation and storage No drilling required. Uses an ezipper and tape system for fast, tool-free attachment. Three-step setup for straightforward installation and removal. Packs down for quick storage when not in use. Why customers need it Reduces drafts and temperature fluctuations at the window perimeter. Helps lower heating and cooling costs by maintaining a sealed indoor environment. Provides a weather-resistant, reusable solution without permanent modifications to the window. Typical use scenarios Apartment or home: Improve air conditioning efficiency during summer and reduce heat loss in winter without altering window frames. Temporary rental or seasonal needs: Install quickly when needed and remove easily for storage or when moving out. Workshops, garages, or small offices: Create a flexible sealed opening for vents and small windows to keep a controlled indoor environment. Practical notes Confirm window perimeter measurements (up to 300 cm) before purchase to ensure proper fit. The kit is intended for temporary to semi-permanent use and is removable for storage.