AR 670-1 compliant, the lightweight SFB B2 is designed for speed and flexibility over rough terrain. The rugged sole is equipped with an aggressive traction pattern and sticky rubber for multi-surface grip, plus an internal rock shield to help prevent punctures. Nike Air cushioning in the heel delivers high-performance comfort, no matter where your adventure takes you. Benefits - Full-grain leather and nylon canvas provide durability and breathability. Dual-zone lacing integrates with a webbing system for enhanced stability and support. Shallow flex grooves are anatomically placed, letting your foot move naturally while preventing debris from sticking. Zoom Air cushioning helps provide a quick-off-the-ground sensation. Product Details - Foam midsole. Rubber outsole.