The world is your oyster in the 5.ZERØGRAND Explore Hiker Boot. The rugged upper is crafted in waterproof materials and also features thermal insulation to keep you warm and dry no matter the adventure. Plus, a nonslip rubber outsole and our patented FlowerFoam™ sole, designed with a minimum of 25% naturally derived or recycled content by weight, provides cushion and stability while walking on the trails or in the city.