The upper blends with the standard midfoot section, allowing the genuine leather and synthetic materials to flow from the heel to the forefoot through the mesh underlay, for a streamlined, seamless look. While the modern design represents one of the most dramatic changes from the 990, the biggest change is the shoe's interior construction, which features FuelCell foam cushioning in the midsole for on-the-go comfort. New Balance MAID has a domestic value of 70% or more. MAID accounts for a limited portion of New Balance's U.S. sales.