Built for comfort, these boots are 70% lighter than other waterproof rubber and PVC knee boots. With 100% seamless waterproof construction, and tiny air bubbles that self-insulate, keeping feet warmer in the cold and cooler in the heat. Great low temperature properties for flexibility and durability. Cleated outsole design for good traction. Lightweight, removable polyurethane contour insole completes the comfort experience.