You’re going to want to start sprinting from the moment you lace up the Brooks Hyperion GTS 2. This speedy shoe’s light and springy cushion packs a punch with every stride while the GuideRails support system keeps excess movement in check so you can stay locked in when you’re running, racing or training. Details: Upper: The lightweight, breathable mesh upper keeps your feet cool and secure during intense workouts. Midsole: Nitrogen-infused DNA FLASH v2 foam delivers an energetic rebound that's nearly 10% more responsive than before to help you run fast. Brooks’ GuideRails® support system provides a holistic stability mechanism that supports your body in its natural motion path while keeping excess movement in check. Outsole: RoadTack Rubber is made with recycled materials and offers lightweight durability and rebound.