+3C to -4C (37F to 25F). FLEXI differs from the other klisters by being made for more varied snow, from fine to coarse. The ideal range is slightly on the colder side, but gives also grip above freezing (32F). It is the klister that can take the most fine grained snow of all klisters in the market. The reason is that FLEXI contains silver. Compared to K21N Silver Universal it is slightly harder and can thus take colder and more fine grained snow.