Challenge's Forte Tubular has an aggressive tread for an excellent ride in wet weather. It's hand made on their supple 300tpi SuperPoly casing with a durable tread compound and tough polyester in the sidewalls. The center tread rolls quickly while the side tread sticks to the road in the corners. You also get a puncture-resistance layer beneath the tread and a latex tube. Latex tubes are lighter, thinner and more flexible than butyl tubes, increasing your comfort, lowering rolling resistance, and helping to prevent flats, too.