adidas PureBOOST Trainer Men's Training Shoes Core Black/Solid Grey : Energy - Power - Durability Designed for both running and cross training, the adidas PureBOOST Trainers are a modern take on fitness footwear. These training shoes feature a knit upper that is both flexible and breathable for absolute comfort during your workout. A unique ankle strap addition provides another layer of support around the foot. Lastly, the Boost(TM) midsole provides supreme cushioning and energy return while the rubber outsole creates traction and durability. Key Features: Breathable knit upper with lace closure and ankle strap offers excellent support and stability. Boost(TM) midsole provides cushioning and energy return with every step. A rubber outsole provides excellent traction and durability.