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, while an internal rock shield helps prevent punctures. And Nike Air cushioning in the heel keeps you comfortable no matter where your adventure takes you. Design Leather and nylon canvas provide durability and breathability Dual-zone lacing integrates with a durable webbing system for enhanced stability and a secure fit In-Shoe Comfort Zoom Air cushioning helps provide a quick-off-the-ground sensation Durability & Traction Shallow flex grooves are anatomically placed, letting your foot move naturally while preventing debris from sticking Additional Details