The Evolution of the Nepal Extreme has taken hardcore mountaineering boots to another level. The addition of Gore-Tex Duratherm lining makes the boot completely waterproof and warmer for high altitudes and extreme cold along with a new breathable tongue for moisture management. With the addition of the patented 3-D flex ankle system hinge, an intergrated anatomical elastic snow gaiter and the 3.2mm silicone impregnated Idro-Perwanger Roughout Leather with sticky rubber rands the Nepal EVO will climb better than ever. The sole has a new tapered HP3 midsole with shock absorbing PU inserts under the heel and the ball of the foot, the new IBS (Impact Brake System) designed exclusively with Vibram to soften impact on hard ground and improve traction.