Men's Clam Extra Heavy Boot XL/2XL Crew Ice Fishing Socks 19921-15635 This heavy sock is designed to be an over sock, or used with a performance liner for maximum warmth and comfort. With thermal and moisture-wicking properties, this heavy sock is perfect for winter activities... designed to keep your feet warm and dry, even in extremely cold temperatures. Features Merino-Nylon-Spandex blend for moisture wicking properties Arch and ankle support reduce sock slippage Heavier weight thermal over-sock Men's Clam Extra Heavy Boot XL/2XL Crew Ice Fishing Socks