What type of underwear is authorized for flight suits?

The authorized type of underwear for flight suits is wool or NOMEX. This is because these materials are specifically chosen for their fire-resistant properties, which provide an added layer of safety for pilots in the event of a fire or explosion in the cockpit. Wool has natural insulating properties and can help maintain body temperature, while NOMEX is a synthetic fiber that is inherently flame-resistant and does not burn or melt, which is essential for high-risk environments such as flight.

In aviation, safety is paramount, and the materials worn under flight suits must support the overall protective strategy against heat and flames. As such, other materials like cotton and silk, while comfortable, do not offer the same level of protection against fire hazards. Synthetic fabrics, though they may have moisture-wicking properties, are often not suitable if they do not have inherent flame-resistant characteristics. Therefore, wool or NOMEX is the best and most appropriate choice for use under flight suits.