Why is wool called a bad conductor of heat?

• Wool is a poor conductor of heat because it traps a large amount of air between its fibres.
  
• The wool itself is not the insulator but the air is. 
• When our hands or feet are very cold, it is better to wear two thinner pairs of gloves/socks than one thick pair because the layer of air trapped between the two gloves/socks on each hand/foot acts as an extra insulator keeping the heat generated by the body inside the gloves/socks instead of letting it out. 
• Sheep also has wool on its skin to keep warm on the exposed hillsides where it lives.

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Updated on: 10-Oct-2022

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