Big version of the first an only asymmetric donut for single tanks. Suitable for up to single tanks 10-18 L 200 bar. Very light: 650 g. Outer hull made of soft Cordura 1000D, inner bladder made of PU210. The 3D construction results in a high position of the diver at the surface and this is more safety. Apart from this , this shape supports a "perfect configuration", because the regalator hoses can be canfigured in an optimal way.