Northwave sonic 2 srs road shoesnorthwaves sonic 2 offers performance and purpose in a great looking shoe with a carbon reinforced sole and asymmetrical straps with ratchet closure system for a more comfortable and secure fit the sonic is ideal for a range of activities from training and racing to touring or commuting an nrg air carbon reinforced nylon sole provides stiffness whilst the airflow system channels fresh air inside the sole and allows your feet to breathe for reduced weight and