GRIPDRY™ TECHNOLOGY IMPROVES STABILITY FOR CROSS-TRAINING Swiftwick FLITE XT® is the most technologically advanced cross-training sock ever developed. Engineered to improve stability during fitness activities that require quick lateral transitions, FLITE XT® incorporates our GripDry™ Fiber and AnkleLock™ Technology. GripDry™ was developed using an innovative grip fiber to prevent your foot from slipping inside your shoe, but we didn't stop there. We blended it with our signature Olefin fiber to wick moisture and keep your feet dry. Then we took it one step further. We added AnkleLock™ Technology, which offers extra support around the ankle during high-intensity training. Take FLITE, stability never felt so good.