Abstract: Air gaps entrapped between a protective garment and the human body are known as a major factor affecting the garment’s thermal protective performance. According to the request of the air gap determination of protective garments for studying the garment thermal performance, a 3D human body scanner was used to get the data cloud of nude and dressed flash fire manikin, the reversing engineering software Geomagic Qualify was utilized for modeling and getting the determination of air gap’s distribution and quantification of air gap size at each sensor location of different garments by 3D compare.

Key words: air gap under clothing, human modeling, 3D body scanning, air gap thickness