Merrell Bergenz WP Brown Treated with Antimicrobial SolutionFull grain leather upper. Protective rubber rand and toe cap. Waterproof Membrane. Fleece Lining treated with Aegis® antimicrobial solution, will keep your feet warm and dry. ColdProof™ Ortholite® Insulating Footbed. Molded nylon arch shank to maximize support. Merrell® air cushion in the heel absorbs shock and adds stability. Comfort Range to -25F/-32C.