Whether you're putting in long winter days in the machine shop, on a road crew or on the tarmac, cold and tired feet make it harder to concentrate on the task at hand. The Caliper is designed for jobsite comfort and safety. Feet stay warm and dry in frigid temperatures thanks to a Danner Dry waterproof liner and 400g of Thinsulate insulation. Four layers of cushioning underfoot give you maximum comfort from clock-in to clock-out.