Black Diamond X2 Footwear X2 firefighting boots are by far a superb example of what leather fire boots should feel like and look like. These boots are well worth the investment. I have been wearing these boots since January and I must say that I am impressed. Wearing them is like slipping your feet into your favorite pair of slippers, with stability. They have been tested to the limits and are holding up well. They get the DetroitShields Tested in Detroit approval.