Durable and supple casing with protective layer and a soft, but long-lasting slick tread compound. It's all here in one tight package. The 120tpi casing is a good blend of durability with an eye on performance. It manages to bend and flex with the road, while maintaining solid durability and cut-resistance. A protective belt is included under the tread to keep road debris from entering the casing and causing flatting. The 60A durameter compound offers low rolling resistance in a durameter density that is long lasting. The folding Aramid bead make the WCS Slick easy to install and keeps the weight down to a scant 189 grams.