adidas Energy Boost 2 - Girls' Grade School Unleash your best performance with the adidas Energy Boost 2. Featuring adidas' innovative Boost midsole, this running shoe powers your run with thousands of capsules that store energy when you step down. On toe-off, the capsules release the stored energy so you get an explosive step. The TORSION® SYSTEM allows your foot and shoe to move together for a natural performance. Supportive overlays on the upper and an external heel counter improve fit. AdiWEAR outsole promises long-lasting durability and traction.