Bunny boots

Bunny boots is the widely used nickname for the Extreme Cold Vapor Barrier Boots (Type II) used by the United States armed forces. The linerless bulbous boots retain warmth by sandwiching up to one inch of wool and felt insulation between two layers of rubber and are typically worn with one heavy wool sock. These boots were originally developed at the Navy Clothing and Textile Research Center in Natick, Massachusetts, US, for use during the Korean War.