This model is a heavy-duty, Italian-made hiking boot designed for rugged backcountry terrain. Key features include:
Materials: Durable Hydrobloc full-grain leather upper with a Gore-Tex performance comfort membrane for waterproofing. 
Sole: Equipped with an exclusive Vibram 3D outsole for superior grip and downhill braking. 
Design: Part of Zamberlan's specialized line, offering high support and stability for long-distance backpacking with heavy loads. 
While very similar in profile to other high-end boots like the Asolo TPS 520 GV or the Zamberlan 996 Vioz GTX, the "Flex-STM" label on the side specifically identifies this pair