Gait Mutant X Arm Guard: * Ultra-thin hard plastic provides ultimate protection with less weight * Floating elbow moves with the arm for flexibility * 2-piece elastic/lycra sleeve offers unparallel comfort * Super low profile allows for less bulk * Triceps fit system prevents arm pad from slipping while improving comfort * Grip sections on the inside sleeve prevent pad from slipping down * Moisture wicking liner material moves moisture away from skin during use