Full Grain Premium WATERPROOF Leather W/ Oil & Acid Resistant Outsole. Non-Skid & Non-Marking Tread. Lace To Toe DESIGN W/ Left and Right Side Zipper entry made with Milwaukee Signature Hardware. Smart Mask CLIMATE CONTROL INSOLE W/ Flex Power Toe Design. Linings are Moisture Wicking for Maximum Comfort and Dryness.