Smooth minimal tread tire for city riding bike paths or commuting. Continuous center ridge for added speed and easy pedaling.. Afforability and longevity make this tire a no brainer for daily commuters. SRC - Standard Rubber Compound combines the best attributes of low rolling resistance extreme durability and tread longevity into one universal package that benefits riders of all disciplines. ICAP - A layer of material that runs from bead to bead under the tread to prevent flats less expensive than Iron Cloak. REF - Reflective sidewall striping or hotpatch to aid in low light visibility