Designed with commuting in mind - all sizes feature reflective sidewalls and Iron Cap flat protection. Continuous center line for low rolling resistance and numerous siping lines for water evacuation. REF - Reflective sidewall striping or hotpatch to aid in low light visibility. ICAP - A layer of material that runs from bead to bead under the tread to prevent flats less expensive than Iron Cloak. 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