Optimized neoprene shaft molds to the ankle and prevents the entry of stones and dirt. Stiff sole plate with Force Control limits flex to reduce arch fatigue on long rides. BOA® Fit System with L6 rotary closure, equipped with a guard that prevents unintentional loosening. The torsional TORBAL 2.0 midsole offers flex to support control on descents and in curves, multi-layer EVA foam absorbs shocks for more stability downhill. SHIMANO ULTREAD GF rubber compound and tread pattern tuned for flat pedals.