Convoluted foam, also known as egg crate foam, is a type of foam that is commonly used for bedding, packaging, and acoustic insulation. It gets its name from its unique shape, which looks like an egg carton. This shape allows the foam to distribute weight more evenly, providing a more comfortable sleeping or sitting experience, excellent air circulation, and better insulation. The convoluted foam is made by convoluting, which involves pressing the foam in a specific pattern while slitting to create the egg crate peaks and valley shape. The peaks and valleys can sometimes be adjusted to produce different-sized foam sheets.

It is an open celled lightweight material made from polyurethane, polyether, polyester, or a combination of those materials. It can be used for air and water filtering. They are using for air intakes, electronic cabinets, extractor units, aquariums, vehicle air intakes, HVAC systems and for lining speakers front and grills. They are used to capture and retain dust, debris.

Die cutting is a mass fabrication because of its ability to produce multiple forms in a single pressing, it is mainly utilized to produce bulk quantities at rapid speed process in which you use a machine for cutting out shapes. Materials that can be die cut include paper, fabrics, rubber, fiberglass, metal sheets, foam, wood, and plastics.