Primus Summer Gas 230g.

At temperatures above +15°C, conventional gas mixtures can "over-power" many stoves. When the regulator is turned up fully, more gas flows out than can be burned cleanly because of the high pressure. Efficiency drops, you use more fuel than necessary. Primus has optimized the Summer Gas for temperatures ranging from +15°C to +40°C. It ensures the best possible efficiency in hot conditions.