Abstract
This article demonstrates the thermal sensitivity and conductivity as well as the water permeability and absorptivity of Mongolian yak wool surfaces according to the Kawabata evaluation method. According to the results of the study, the mean value of thermal sensitivity (Qmax) of yak wool surface is 0.051 w/cm2 for down and 0.061 w/cm2 for coarse hair while the mean value of thermal conductivity is 2.08x10-4 (cal/cm ·0C) for down and 2.63x10-4(cal/cm · 0C) for coarse hair.
 This study, with its high level of confidence (p = 0.05), proves the difference between down and coarse hair. Additionally, the study shows a strong correlation between the thermal conductivity and the fiber diameter of Mongolian yak wool, resulting in a correlation level of r = -0.80 for down and r = 0.86 for coarse hair. 
 When measuring the wettability of Mongolian yak wool, yak wool surface exhibited waterproof properties with a contact angle of 146.50 degrees for down hair and a contact angle of 147.10 degrees for coarse hair. The study also revealed a low correlation level of r = 0.39 for down and r = 0.40 for coarse hair when examining the relationship between the contact angle and the diameter of yak wool.
Highlights
The heat retention process that takes place between the yak’s skin layer and hair cover is very complex
The thermal sensitivity refers to the sensation in the human body under the influence of heat flux when clothes made of textiles or other materials come in contact with the human skin [1013]
When examining the relationship between the wetting angle and fiber diameter of yak wool, we found a low correlation of r = 0.39 for down and r = 0.40 for coarse hair
Summary
The heat retention process that takes place between the yak’s skin layer and hair cover is very complex. The yak’s hair consists of breathable fibers that help create a microenvironment between the skin layer and hair cover This microenvironment hosts and regulates the air exchange and heat transfer, which allows the yak to retain its heat in cold climates and maintain its thermal balance from physiological functions. The thermal sensitivity refers to the sensation in the human body under the influence of heat flux when clothes made of textiles or other materials come in contact with the human skin [1013]. This feature has recently become one of the major reasons that impact the sales of underwear, Baigalmaa Danzan et al MJAS Vol 33 (2) 2021 shirts, gloves and jackets. There exists an urgent requirement to conduct a detailed study on the performances of Mongolian yak wool
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