SINGLE LAYER OF LEATHER The sole is composed of a 4 mm single layer of leather with leather heel, with an insert of ultra lightweight thermoplastic material to reduce weight. THERMOPLASTIC WITH AIR SYSTEM The sole made of thermoplastic material to reduce weight and vibrations incorporates the air ow system which ensures a constant exchange of air and maximum breathability for the foot. Fresh air enters through the front of the shoe and warm air is released through the back. The sole is made of thermoplastic material to reduce weight, vibrations and increase the accuracy of blade mounting. It has a leather heel with an insert of ultra light thermoplastic material to further reduce weight. The thermoplastic material of which the sole is composed and the special structure inside the heel lead to reduced weight and vibrations. This boot is a 60 stiffness