The La Sportiva Thunder GTX Mens is a lightweight backpacking boot with an increadible fit that will impress you. The Thunder GTX is waterproof, supportive and rugged with a Vibram outsole to boot. La Sportiva details like rubber toe rands and a molded heel reinforcement make the boot stand out in a crowd. If going fast and light are what you need in a backpacking boot then the La Sportiva Thunder Mens will fit the bill.