A method of producing a porous, rubbery polymer coated sock comprising: 1) preparing a double layered sock; 2) wearing the sock on mold hanging on a continuous line; 3) pre-treating the sole portion of the sock a with calcium nitrate solution; 4) preparing a first nitrile rubber solution by stirring a solution comprising foaming agents and acrylo-nitrile butadiene rubber (NBR) at 1,200 r.p.m. for 30 minutes; 5) dipping the sock worn on the mold in a first, deep bath containing the first, foamed nitrile rubber solution; 6) air-drying the solvent in the polymer solution and developing foam in the rubber layer; 7) preparing a second, foamed nitrile rubber solution by stirring a solution comprising foaming agents and nitrile rubber at 1,200 r.p.m. for 30 minutes; 8) dipping sock worn on the mold in a second, shallow bath containing the second, foamed nitrile rubber solution; 9) air-drying the solvent in the second polymer solution and developing foam in the rubber layer; and 10) washing the sock from step 9) in a cleaning solution to eliminate the calcium nitrate and organic solvents and drying the washed sock 110.degree. C. for 40 minutes. The sock thus produced has a bottom face covered with nitrile rubber foams having 0.5 .mu.m voids therein. The portion of the sock from toe to ball is coated with nitrile rubber foam of 1 mm to 3 mm thickness, while the heel portion of the sock is coated with nitrile foam of 0.5 mm thickness. The nitrile rubber foam coating provides a friction surface as well as a cushion for shock absorption.