Directional tread profile for quiet running and low rolling resistance Equipped with K-Guard, Schwalbe`s entry level puncture protection Green compound is made from renewable and recycled materials Twin Skin - An additional rubber coating on the side protects against cuts and allows for uniform coloring KGRD - Layer from natural rubber, reinforced with Kevlar fibers. The protection standard for every tire from the Active Line REF - Reflective sidewall striping or hotpatch to aid in low light visibility Standard 26x1-1/2 x1-3/8 584 Wire Belted Bk/Bsk/Ref 85 50 KGRD/REF Yes