The Acton SPARK is a medium-width winter boot built for extreme cold down to -45°C. Standing 9″ (22.9 cm) tall, it combines treated synthetic leather and hydrophobic ripstop nylon with H₂O Seal seam-sealed waterproofing. Comfort comes from a removable memory-foam knit insole, synthetic sheep-wool lining, and 200 g Thermolight insulation. A flexible EVA waterproof shell and synthetic rubber outsole provide durability, traction, and stability on snow. The barrel-lock lace system ensures a snug, secure fit with easy adjustment.