UA HOVR Sonic NC Shoes UPPER: A custom flat-knit upper, engineered to provide ventilation and soft-structure. Speedfit 2.0-3D molded heel for a seamless and snug locked-in fit. MIDSOLE: HOVR Foam. Pure infused soft foam wrapped in dynamic textile to contain and maximize energy. OUTSOLE: High-grade durable rubber that runs from heel to forefoot.