Powerful account of the privations and suffering of coal miners in France and their attempts to raise wages and condition by striking. Very realistically told and you feel the darkness in the mine, the hard labour and heartlessness of the bourgeois owners.
They are excellent and I have bought the same ones about 2 years ago & they are still very good. I bought another pair just to stock up for when the first pair wear out. But that may be another couple of years I expect!!