adidas Response Wind Running Pants CLIMAPROOF Fabric - Through its highly protective windbreaker fabric, it will keep strong wind at bay. Back Zip Pocket - For storing small items such as keys or money. Drawcord Elastic Waist - Allows for custom fit. FORMOTION - Engineered to follows the natural movement of sport for a better fit and greater comfort in motion. Leg Zipper - Provides good air flow and ventilation by unzipping the zip.