Code 6 is our most breathable boot offering dependable durability and proven performance. This 8 inch style offers a side zip for easy on and off as well as a cushioned insert for comfort. Lightweight Leather and Nylon Upper. Breathable Moisture Wicking Lining and Mesh Tongue for Ventilation. Padded Collar for Comfort and Ankle Protection. Slip Resistant Rubber Outsole for Traction.