Vintage Colorado Thinsulate Thermal SS Duck Boots8

Vintage Colorado Thinsulate Thermal SS Duck Boots Size 8 Kinney Pro Care Steel shank In good condition Lace up Some normal wear See pictures (#3&4) Simply put, the shank is a load-bearing piece of steel (or another hard, flexible material) that is sandwiched between the insole and the outsole of your shoe. It usually sits between the ball and heel of your foot, under the arch.