This reflective window insulation kit includes 1 roll of 48 in. x 10 ft. aluminum foil insulation, 65 round Velcro adhesive pads, and 1 roll of heavy-duty aluminum foil tape. It comes with a complete set of accessories and fits most window sizes. Featuring a 3-layer construction, the kit has aluminum foil on both sides with a 3 mm polyethylene foam core in the middle, delivering excellent light reflectivity and thermal insulation performance. It blocks direct sunlight and oppressive heat in summer while trapping indoor warmth to prevent heat loss in winter, ensuring a comfortable constant temperature all year round. Durable in quality, the aluminum foil surface also offers sun protection and waterproof performance for long-term stable use. Installation is simple and straightforward: just cut it to the required size with a utility knife or scissors, then secure it using the included Velcro and tape, no professional tools are needed. This versatile product is suitable for a wide range of indoor and outdoor areas such as windows, attics, garages, sheds, RVs, greenhouses, and automobiles. It effectively reduces heat transfer and cuts down on heating and cooling energy costs.