The GREAT STUFF Big gap filler insulating foam sealant is a high-quality spray foam insulation designed to effectively seal and insulate large gaps. With an R-Value of R37, it provides excellent insulation properties to help keep your space warm or cool, depending on the weather. This 12-pack of 12 oz cans ensures you have enough to tackle multiple projects around your home or office, making it a convenient and efficient solution for enhancing energy efficiency and comfort.