Aspen Aerogels, Inc., an energy efficiency company, designs, develops, and manufactures aerogel insulation. The company offers Pyrogel XT and Pyrogel XTF for applications in high temperature steam pipes, vessels and equipment, aerospace and defense systems, fire barriers, and welding blankets; Cryogel Z for use in sub-ambient and cryogenic pipelines, vessels, and equipment; Spaceloft Subsea that is used in medium to high temperature offshore oil pipelines; and Spaceloft and Spaceloft A2 for applications in ambient temperature walls, floors, and roofs in commercial, residential, and institutional buildings. It also provides Pyrogel 2250 for use in medium to high temperature appliances, transportation, and electronics; Pyrogel 6650 for high temperature aerospace and defense systems; and Cryogel x201, which used in sub-ambient, including refrigerated appliances, cold storage, and aerospace applications. Aspen Aerogels, Inc. sells its products to distributors, contractors, and original equipment manufacturers of insulation products, components, and systems in North America, Europe, and Asia. The company, formerly known as Aspen Merger Sub, Inc., was founded in 2001 and is headquartered in Northborough, Massachusetts.