Optimized neoprene shaft hugs the ankle and prevents the entry of small stones and dirt. BOA® Fit System with a Li2F twist lock including cover against accidental loosening. Force Control midsole with extreme stiffness for uncompromising downhill use. The extended pedal channel construction offers outstanding SPD stability when unclipped. Enduro-optimized SHIMANO ULTREAD GE rubber compound and grippy tread pattern.