Woven Polyester/ProtecPU upper protects against rocks, sticks and makes for long lasting comfort. Non-water absorbing for keeping feet comfortable and reducing friction. Provides a better fit and gives snug fit in heel without hot spots. Better stability on the trail to keep you sure-footed. BUGrip® patented sole for traction on wet, dry, slippery surfaces. Special lugged sole design gives you all season traction. Lightweight for less fatigue at 11oz. Fixed studs, outdoor use only.