These ultimate trekking boot are designed to meet the demands of serious trekkers that are looking for the highest level of comfort and protection to move confidently on variable terrain for single or multi-day treks. The Forge S is a full synthetic version built with an innovative fabric developed by Tecnica that is durable and offers the elasticity to conform to the anatomy of the foot when thermo-formed. A heat-lamination of TPU film adds protection and durability.