Advance Lightness 4 (M): The Most Comfortable Seating Position Built Without a Seat-Board

The appeal of the Lightness 4 is clear. In a 3kg-class seat-less build it produces a comfortable, board-free seating position, and its thermal turn radius tightens up more than the NK Arrow's. But the heart of it lies beyond the spec sheet. A harness's fit is ultimately decided by the pilot's body. In practice, the support under the thighs can require sizing up to Large depending on your build. So this isn't a harness you settle on from specs alone. A review can fill only half the picture; the other half gets filled only by hanging in it yourself. Bassil makes the point directly: "I am just writing you one half, you have to cover the other one by a test flight." For the pilot who wants lightness and comfort together it's a strong candidate, but it's closer to a harness where the test flight isn't optional, it's the premise.