HAIX Fire Hunter ExtremeFIRE HUNTER EXTREME Upper Materials The upper material of the HAIX Fire Hunter Xtreme is made of smooth leather with a recessed handle at the top on each side to make it easy to pull the boots on in a hurry. Combined with the inner lining, the Fire Hunter Xtreme also gives extra protection against chemicals and bloodborne pathogens. The leather is a HAIX Sun Reflect specialty leather to keep your feet cool, even in direct sunlight. The HAIX AF Ankle