1.6-1.8mm Top Grain Crazy Horse cow leather. 
ATOP stainless steel Laces Tightening system.
 PU laminated Cow embossed.
Waterproof & Breathable membrane.  
Foot Bed made of EVA and nitrile special compound, with high bearing capacity and variable thickness Thermoformed, anatomic, punched and coated with highly breathable fabric.
Anti-slip Oil and Petrol Resistant Rubber Sole
Non-Metallic zero perforation mid Sole
EN 13634:2015.