The Rocky RKYK103 is a technological wonder via the Rocky Boot company. This amazing waterproof boot is made to the lightest specs that a composite toe safety boot can be. This boot is made of full grain leather and nylon mesh for weight. The toe has an ASTM rated composite safety toe. The interior is made with smooth soft mesh for comfort. The Rocky waterproofing system is one of the best in the business. An amazing polyurethane insole makes this boot so comfortable, especially when it interacts with a rubber skin outsole that is slip and oil resistant. This boot is also EH rated for electrical hazards.