Please select 1 full size up (if you wear a size 9, please choose size 10). Run faster. . . Jump higher. . . Get stronger! If you want to win, you need a new angle on the competition. SpringBoost s B-Train Action is a performance training shoe addressing the needs of both athletes training for a specific sport, and active individuals working out to attain their personal goals. -Activates more muscle fibers during workout. -Stabilizes and strengthens the core muscles, hamstrings, calves and glutes by working the entire muscle chain. -Increases vertical leap and explosive power. -Improves range of motion and flexibility. Mesh upper is lightweight and breathable. Adjustable strap for mid-foot support. Reinforced lacing loops with speed lace system. EVA midsole provides maximum comfort and shock absorption. Energy Plate increases your range of motion while conserving your energy. Molded TPU shank delivers control and stability. Insoles made of EVA and PU absorption beans which provide support and limit energy-loss while walking. The insoles are constructed moisture wicking holes and arch support for greater stability and toe-off. U-Control Insole System with DORSI 1, 3, & 5 insoles. -DORSI 1 degree gets you started. Wear for the first couple of weeks. -DORSI 3 degree adds intensity to your workout. -DORSI 5 degree yields even higher training intensity.