Both of these samples in the Museum's collection contain a fiber called Nomex. Nomex is heat-resistant and is used in modern spacesuits. The sample on the left is Nomex felt, while the sample on the right is Nomex webbing. 

Source:

Smithsonian's National Air and Space Museum

Owner:

Smithsonian Institution

Rights Usage:

Contact Smithsonian Institution

Terms of Use:

Smithsonian Terms of Use

For print or commercial use please see permissions information.