Live fast in the ECCO BIOM 2.1 X MOUNTAIN, a new athletic hiking boot with the stability for longer, more challenging trails. With its reinforced sole construction, rock plate and ECCO PERFORMANCE RUBBER outsole, this boot lets you move quickly on more demanding terrain. For speed, the BIOM® NATURAL MOTION® Technology encourages your foot to move more naturally and efficiently, while the PHORENE™ midsole delivers energy return and bounce. Engineered from ripstop fabric, the boot has GORE-TEX waterproof protection while the innovative outsole cleats provide grip, traction and stability.