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In footwear, a hobnail is a short nail with a thick head used to increase the durability of boot soles.

Hobnailed boots (known in Scotland as "tackety boots") are boots with hobnails (nails inserted into the soles of the boots), usually installed in a regular pattern, over the sole. They also usually have an iron horseshoe-shaped insert, called a heel iron, to strengthen the heel, and an iron toe-piece. The hobnails project below the sole and provide traction on soft or rocky ground, ice, and snow, but they tend to slide on smooth hard surfaces.

They have been used since antiquity for inexpensive durable footwear, often by workmen and the military, including as the trench boots of World War I. They gained particular notoriety during the Second World War as the standard footwear of German troops, which in conjunction with the distinctive goose-step march upon cobblestone streets, left a lasting impression of their martial entrance into countless towns and villages throughout Occupied Europe

 from wikipedia