Glove-construction Soles Boreal Zenith Pro thickness 4 – 4 inches (according to size). Features: Its asymmetry along with a perfectly fitted toe makes it easy to work your finger on small grips. An ergonomics studied in detail increases the performance of the heel to amazing levels. Exceptional model use for climbing free of difficulty in all its modalities. Particularly interesting in sequences where good support and precision is required on the edge and the toe.