Dr. Martens is a footwear, clothing and accessories brand, and the footwear products are most often known as Doc Martens, Docs or DMs.
The footwear is distinct because of its air-cushioned sole (dubbed Bouncing Soles), developed by Dr. Klaus Mrtens of Germany.
The boots and shoes have been especially popular among skinheads, punks, grungers and members of a few other youth subcultures.
Klaus Mrtens was a doctor in the German army during World War II.
While on leave in 1945, he injured his ankle while skiing in the Bavarian Alps.
He found that his standard-issue army boots were too uncomfortable on his injured foot.
While recuperating, he designed improvements to the boots, with soft leather, and air-padded soles.
When the war ended and some Germans looted valuables from their own cities, Mrtens took leather from a cobbler's shop.
With that leather he made himself a pair of boots with air-cushioned soles.