These boots have been designed with uppers that are a combination of TPU (thermo-plastic urethane) infused nylon and leather making it durable and giving it great resistance to abrasion. The external TPU toe has been added to help with durability and abrasion resistance. The interior features a high-performance mesh lining and a waterproofing system to guarantee that your feet stay dry and comfortable no matter how long you’re on your feet. They meet the standards for protective toe and electrical hazard safety footwear making these boots one of the most safe and comfortable things you can put on your feet.