The NIKE SFB Gen 2 is an evolution to NIKE’s classic SFB collection. The new style takes the comfort you’ve come to expect from the original SFB and adds some incredible features. The new webbing support system increases stability and provides a locked-in fit all the way up to the ankle. With an internal rock shield and a layer of Kevlar, this boot is one of the toughest NIKE has ever made. The Gen 2 is topped off with an aggressive full-rubber outsole, complete with a saw-tooth arch to aid in fast roping.