The level of rigidity of a boot depends mainly on its midsole.

We use six different Bestflex midsoles made from different materials, giving our boots five different levels of rigidity and flexibility, each ideal for its intended use.

The midsoles marked with a ‘+ P®’ are aditionally lined with PORON® Performance, which gives the boot a high energy return and excellent impact absorption for the complete life of the boo (for more information, see: PORON® Performance)

Bestflex 6 / Semi-rigid

A practically rigid midsole but with a certain degree of flexibility for comfort during longer treks, used in boots made for activities in complicated terrains as well as for less-technical alpine climbing,.