Caterpillar Men’s Diagnostic Steel-toe Flat Feet Work Boots Caterpillar Steel toe is one of the best work shoes for flat feet. It is a boot and you will of course need these kinds of boots for going to office. These are comfortable and excellent for walking. This shoe is made up of leather and sole is of rubber. It is a durable and comfortable boot by Cat which you can wear for work. The shoe is made up of 100 % waterproof leather.