These 2XCool Sport Boot by Professional Choice was designed on three principles: Cooling, Comfort, and Durability. Powered by brr* performance fabric, a technologically advanced textile that combines naturally cooling minerals, active and rapid drying to create a "Triple Chill Effect" that instantly and continuously draws away heat and moisture. Plus a new Kevlar patch on the suspensory strap flexes with every step to provide the ultimate support and protection without restricting movement.