Tubular (sew-up) race tires are an alternative to clincher tires. Often lighter and more durable than clinchers, tubular tires feature a completely rounded profile. Tubular tires are glued to the wheels instead of hooking or clinching in. Tubular tires also feature tubes sewn into the tire, making them a one-piece construction. Because they can offer better touch and feel, tubular tires are popular with road racers and triathletes. Popular tubular road tire brands include Vittoria, Continental, Tufo, and Michelin.