Adidas has energized the stability running category. The Solar Glide ST is built on the responsive Adidas Boost midsole. The new mesh is built with flex-fold ribs that were inspired by NASA spacesuit gloves. The dual density Boost helps stabilize the runner keeping the arch and ankle from over pronating. Adidas did not stop there when it came to having a smooth ride. The Fitwing tongue extends down around the foot for a snug supportive fit. The Solar Propulsion Rails help support and guide the foot through the gait cycle.