The La Sportiva Olympus Mons EVO Boot is a double boot for high altitude mountaineering. When the peak is 8000 meters, the conditions turn from harsh to extreme and your feet need all the help they can get out there. At 49.86 ounces, these puppies are considered lightweight, so step inside and just revel in the PE thermal insulating inner boot. The outer boot has a Cordura® lined upper with some closed cell foam to insulate, as well as a Vibram® rubber rand for plenty of durability. The built in gaiter comes up high, preventing snow and water from soaking on in with Cordura® and Kevlar® fabrics that are incredibly durable and waterproof. With or without crampons, these monsters will help you climb to the top.