Thermal conductivity of water, air, cotton, polyester and PP

Thermal conductivity of water	0.58 [W m-1K-1] at 25 °C
Thermal conductivity of air	0.0257 [W m-1K-1] at 25 °C
Thermal conductivity of cotton	0.4 [W m-1K-1] (its range is 0.3-0.5)
Thermal conductivity of polypropylene	0.25 [W m-1K-1] (its range is 0.2-0.3)
Thermal conductivity of polyester	0.3 [W m-1K-1] (its range is 0.2-0.4)

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source: http://www.engineeringtoolbox.com