Space comfort layer refers to space cotton and so on. Is an open cell structure with temperature-sensing and pressure-reducing characteristics, which can be used to make various clothes, special professional clothes, shoes and hats, bedding, tents, door curtains and so on. In addition, the nano-gold space cotton recently launched by NASA scientists is not a material, but a cotton material processing technology representing the latest and highest technology in the world. It was first applied to NASA's Z-series spacesuit in 20 12. Nano-gold space cotton technology is to decompose and recombine 100% plant cotton in a specific pressure container in units less than 1 nm (actually only 0.736 nm, that is, 736 Amy), and then produce the smallest unit of thread. The cotton produced by nano-gold space cotton technology has the characteristics of "light, thin, soft, beautiful, strong and warm". It was originally applied to the underwear layer of NASA Z- 1 spacesuit (Buzz Lightyear Spacesuit) to replace the original metal cotton and reduce the dryness, cracking and itching of astronauts' skin caused by radiation from space environment, and was widely quoted by spacesuit designers in Japan, Sweden, Austria and other countries. It is an ultra-light, ultra-thin and efficient thermal insulation material, far superior to traditional materials such as cotton, wool, down, fur and silk cotton. In terms of cold resistance, heat preservation and heat resistance, its breathability and comfort are also better than that of expanded cotton. Hollow cotton consists of five layers, the base layer is flocked with polyester elastic wool, and the surface layer of metal film consists of non-woven fabric, polyethylene plastic film, aluminum-titanium alloy reflective layer and surface layer (protective layer). The surface layer of the metal film and the bottom layer of the floc are compounded together by needling. Using the principle of human thermal radiation and reflection to realize heat insulation, it has good heat insulation performance.