The Men's Nucleo GTX Boot from La Sportiva combines a range of technologies to provide you with comfort in all conditions while maintaining fantastic breathability. The combination of GoreTex Surround and Nano Cells technology ensures breathable, waterproof protection to help maintain a comfortable and healthy environment for your feet on the inside of the boot. The use of the STB Control System in construction ensures excellent torsion resistance and works to ensure a snug fitting and stable boot.The Impact Brake System on the outsole ensures excellent traction, particularly on descents, making this boot, on the whole, a great option for those who love to move fast across tricky terrain.