Multi-ply knit fabric

An article of clothing comprising a multi-ply knit fabric having an upper and lower surface, wherein the fabric is oriented such that the lower surface of the fabric faces the wearer of the article of clothing, wherein the fabric comprises:

• an first knit ply comprising a plurality of first yarns, wherein the first knit ply forms the upper surface of the fabric;
• a second knit ply comprising a plurality of polytetrafluoroethylene (PTFE) yarns, wherein the PTFE yarns have a density of 2 to 2.3 g/cm3 a transmission in the IR region of 8-10 μm at least 40%, and a thermal conductivity of at least 0.2 W/(m·K), and wherein the second knit ply forms the lower surface of the fabric;
• wherein the first ply and the second ply integrated through combined portions formed by at least one method consisting of interlacing first yarns among the PTFE yarns of the second knit ply, interlacing PTFE yarns among the first yarns of the first knit ply, and interlacing a plurality of third yarns among the first yarns of the first knit ply and the PTFE yarns of the second knit ply.