The La Sportiva Men's Core High GTX Boot uses Gore Tex Surround technology to enhance waterproofing and breathability for backpackers and hikers. Unlike traditional waterproof membranes, the Surround membrane wraps completely around the foot for waterproof protection, and it ensures excellent breathability through the sole's breathable mesh inserts. La Sportiva's Nano Cell upper fuses ventilated AirMesh with protective PU reinforcements for comfort and long lasting durability. Underfoot, La Sportiva worked with Vibram to give the Core High GTX Boot's sole plenty of traction on any terrain. The Impact Brake System places slanted lugs at the heel to increase braking power and decrease impact forces by 20%. A compression molded EVA midsole gives you plenty of cush for long trails, and the TPU inserts ensure stability on rugged ground.