Fresh Foam X Hierro V7 GTX, shoes for unique challenges For those who want to get off the beaten track, there is the Fresh Foam X Hierro, a dedicated off-road application of New Balance's best running technology. People love the idea of adventure in the great outdoors, but there’s more to the natural landscape than fresh air and scenic views. Uneven terrain, debris, and moisture are unique challenges to footwear that require specialized construction. The Fresh Foam X Hierro v7 GTX employs a Vibram Megagrip outsole and a GORE-TEX waterproof lining to create a protective shell of durability and traction around the signature Fresh Foam X cushioning. Features Drop: 8 mm (due to variances created during the development and manufacturing processes, all references to 8 mm drop are approximate) Fresh Foam X midsole delivers our most cushioned Fresh Foam experience for incredible comfort Synthetic and mesh material GORE-TEX waterproof fabric protects feet from wind, rain and water without sacrificing breathability Upper features a breathable yet protected construction Upper features no-sew overlays for a sleek fit and feel Vibram Megagrip outsole provides superior grip Real weight: 310 g (Uk 8.5) Technologies Gore-Tex Gore-Tex fabrics offer long-lasting, comfortable weather protection. The technology is based on an extremely thin membrane made of expanded polytetrafluoroethylene (ePTFE). Its pores are too small for rain to penetrate, yet big enough for perspiration to pass right through. Gore-Tex products have a high waterproof rating (water column) and can withstand up to 28,000 mm of water pressure – more than monsoon rain. The membrane is bonded between an outer fabric and a high-performance lining. Depending on the construction, the result is either a 2-layer, 2.5-layer or 3-layer laminate. Gore-Tex in a 3-layer construction offers a combination of enhanced durability and high breathability, while the 2-layer laminate provides lightweight weather protection.