Armstrong S1 Foil KitArmstrong Step One Foil Kit Redefining how we learn to foil, the Step 1 (S1) foil range delivers remarkable stability, ultra low flying speed and an instantly intuitive feel to make the first step into foiling as accessible and forgiving as possible. Pitch, roll and yaw stability are critical to success when building foiling skills. The S1 design achieves a near autopilot like level of predictability thanks to a combination of leading and trailing