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Child health in the Third World

provided an opportunity to test the slip resistance of a number of shoe materials. Seven types of footwear were used, one with leather soles and heels and the remainder rubber or plastic of unknown composition. All except one were smooth with no tread pattern. All seven types were worn and tested by one of us. The slip resistance was rated subjectively and the footwear listed in order of increasing slip resistance. The hardness of each sample was then obtained by using a Shore A durometer. Finally, the angle of slip on an oily, polished steel plate was determined. With the exception of the leather, which is known to have properties different from the rubber and plastic compounds, the slip resistance on dry ice was inversely related to hardness, the hardest material being the most dangerous and the softest material giving the best slip resistance. By far the best subjective slip resistance on dry ice was obtained with the Dunlop "Snowmobile," which gave the lowest durometer reading and also had an intricate tread pattern. It is no longer in production. There was general agreement between slip resistance on ice and on an oily steel plate. It is hoped that this small-scale test will promote greater interest in the slip resistance of shoe materials.