The puncture resistant steel toe waterproof Rocky RKYK110 work boot meets just about every standard imaginable. The upper of this boot is soft full grain leather. The interior has a full length waterproof liner that is under the traditional mesh lining. This gas, oil, grease and slip resistant boot meets all ASTM rated guidelines including the puncture resistant standards put forth and tried on only the most durable boots around. The insole is soft polyurethane and is forgiving to the feet after a long days work. This boot is made for you and your tough, long days.