HydroGuard - HydroGuards waterproof membrane operates and performs similarly to other waterproofing technologies. Billions of microscopic pores cover the membrane, which provides dependable waterproof properties. These pores are too small for water droplets to pass through, but the perfect size to allow water vapor molecules from internal moisture escape. Vans new HydroGuard 360º keeps a high waterline for maximum waterproof protection, while the new HydroGuard Wrap provides a lower splash and puddle guard around the shoe and over the toe. In either case, the result is reliable and comfortable, breathable waterproofing no matter where your journey takes you.