Wool
This is: durablegood, material, good, tradable
2 terrains make wool from 
work, 
wheat
2 terrains use wool to make 
clothes, 
yarn
5 terrains are built with wool
Commodity info
Weighs 20
7% is
lost every year
Serves 1000k people a year
Satisfies 1% of a city's durable goods needs a year
Sometimes purveyed by
Jackfornold's Pelts