Advance Sigma

The Advance Sigma is a series of Swiss single-place, paragliders, designed and produced by Advance Thun of Thun.
Design and development.
The Sigma was designed as a cross country intermediate glider.
The design has progressed through nine generations of models, the Sigma, Sigma 2, 3, 4, 5, 6, 7, 8 and 9, each improving on the last. The models are each named for their rough wing area in square metres.