The Men's SITKA Back40 Boots combine an ultra-tough, fully waterproof build with lightweight, sneaker-like comfort. These high-performance boots feature a premium waterproof rubber and neoprene upper that is zonally molded to deliver targeted protection and flexibility. They are packed with low-bulk 800g Thinsulate insulation for advanced temperature regulation, while the interior features a full-length, molded EVA midsole for underfoot comfort and cushion. Reinforced with durable rubber overlays on high-wear toe and heel zones, the boot is finished with a rubber outsole powered by the SITKA Apex Tread System for maximum traction on unforgiving terrain.