Bogs Men's Ultra Mid-M 100% - 70% Rubber/30% Neoprene Imported Rubber sole Durable hand lasted rubber with four way stretch inner bootie Constructed with 7 millimeters of neoprene Max-wick moisture wicking lining Dura fresh bio-technology lining activates to fight odors Comfort rated to -40 degrees Fahrenheit or -40 degrees Celsius