This 40-foot garage door top and side seal is constructed from durable TPE material that retains consistent elasticity across a wide range of extreme temperatures, from -58 degrees Fahrenheit up to 275 degrees Fahrenheit, so it will not crack or shift out of place even under harsh seasonal weather conditions. It creates a tight, continuous barrier along the top and two side edges of your garage door, blocking out unwanted debris such as leaves and dust, as well as rain, snow, drafts of cold air, and excess outdoor moisture to keep the interior of your garage at a more stable, comfortable temperature and free of dampness. The seal comes with both strong self-adhesive backing and included reinforcement nails to ensure it stays firmly attached to the door frame without peeling away over time, and it also helps reduce exterior noise transmission and block harsh direct sunlight to maintain consistent indoor humidity levels. It fits most standard residential garage door sizes, and can be trimmed easily to match your exact door dimensions for a seamless, unobtrusive look that blends in with surrounding trim. Material: Composite.