The 13121 is the kitchen sink of work boots. It has everything. Internal Metatarsal Guard, check. External patented Super-Guard X Met Guard, check. Hytest High Energy Footrest patented technology for extreme comfort, check. Waterproof, check. Abrasion Resistant Heel Cap, check. Molded TPU Toe Cap, check. Puncture Resistant, check. Electrical Hazard Protection, check. Lightweight Asymmetrical Composite Toe Cap, check. The 13121 has the industry leading dual internal and external met guards. The internal features Poron XRD patented technology, and the external features the Hytest impact protection technology. The 13121 has a waterproof full grain leather upper with high abrasion resistant heel, HY-VIS trim for added visibility in low light, molded TPU toe guard for boot longevity, abrasion resistant mesh lining for added durability and comfort, HY-Dry waterproof barrier membrane for dry feet and breathability, Wellmax puncture resistant fabric plate, molded polyurethane high energy performance midsole, molded EVA stabilizer and foam footbed for added comfort and support, moisture wicking brushed Nylex sock liner, Dura-Tech oil and slip resistant rubber outsole. Asymmetrical composite toe. Electrical Hazard compliant.