Closed-cell foam is a type of foam material where the cells are completely enclosed, preventing air and moisture from entering. This structure makes it denser and more rigid compared to open-cell foam. It is commonly used in insulation, flotation devices, and packaging due to its durability and resistance to water. Because of its closed structure, this foam provides excellent thermal insulation and soundproofing properties. It is often found in products like yoga mats, sleeping pads, and protective gear. Its lightweight nature and ability to resist compression make it a popular choice in various industries, including construction and manufacturing.