Designed with commuting in mind - all sizes feature reflective sidewalls and Iron Cap flat protection 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