The Columbia Boys' Powderbug Forty Print Boot delivers Arctic expedition-worthy warmth to your little dude's feet for unmatched coziness in the coldest conditions. It features a hefty dose of insulation and a thick removable felt liner to keep his feet toasty when temps are well into the negatives. Meanwhile, the waterproof upper shrugs off snow and slush, and the rugged TPR outsole helps him keep his footing on slippery surfaces.