Which innovative product design feature was first introduced in the M-1943 combat boots used by the US Army during World War II that fundamentally changed military footwear?

Product design in military history has often led to innovations that later influenced civilian markets. One of the most essential pieces of military equipment is the combat boot - designed to protect soldiers across varied terrains while providing durability and functionality. This poll tests your knowledge about a significant evolution in military footwear that revolutionized battlefield mobility and soldier effectiveness.

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The incorporation of a steel toe cap for added protection
The introduction of a double buckle system instead of laces
The use of a rubber sole with a distinctive tread pattern for better traction
The addition of Gore-Tex waterproof lining