Despite recent advances in carbon clincher wheels, tubular tires are still the benchmark for race day road feel. Tubs do, of course, come with some drawbacks not least of all being the risk of a flat during your target event so Continental builds its 4000 S II Tubular Tires with a puncture-resistant Vectran yarn casing. Vectran is a sort of super cotton, made from liquid crystal polymers 240tpi for a supple road feel that doesn't wilt under duress.
The 4000 S II Tubs may be mass-produced tires, but the legendary Black Chili Compound means they grab the road like a boutique model made by artisanal French craftsmen sewing tires in their backyard. The casing is also seamless, which makes for a ride uniformity and impeccable tire seating that tires from those craftsmen simply can't match.