The Puma Fast-Trac Nitro 3 GTX shoes in Gray and Black are designed for men’s trail running, specifically for size 13 feet. These athletic sneakers feature a Gore-Tex technology for waterproof protection, making them suitable for outdoor activities in various weather conditions. With a 100% authentic guarantee, these shoes are part of the Fast-Trac Nitro 3 GTX product line and are manufactured in China. The synthetic upper material and medium width provide comfort and durability for athletic use.