The LaCrosse AeroForm technology features a revolutionary liquid polyurethane over neoprene construction, which provides an extremely lightweight and flexible glove-like feel to the boot while making it highly durable, abrasion-resistant, and insulative. The boot is waterproof, scent free, and a liquid rubber protective coating on the seams. The Aerohead has a quick drying and moisture wicking jersey knit lining, and a midsole is injected PU with an integrated shank to provide support and stability, and the non-loading outsole features a lightweight rubber compound with durability and traction in mud. Fit: True to Size Outsole: Rubber Upper: Neoprene