Assume speed demon status in the gnarliest environments in the all-new Summit Unknown GTX for men, showcasing detail-obsessed craftsmanship that balances durability with lightweight materials and a reengineered tongue for a more distinct fit. Underfoot, REVlite foam offers lightweight cushioning while HydroHesion advanced rubber compound helps you get amphibious by offering grip in environments wet and dry, while aggressive lugs with a newly increased depth help you climb forward. The forefoot Toe Protect feature offers a mean barrier against loose dirt and rocks.