Most tires that are "H"-rated (and ALL tires that are "Z"-rated) have a nylon cap belt to deal with the higher centrifugal loads and heat encountered with continuous speeds well above 140mph. "S"-rated (112mph) tires, which include ALL the "cosmetic performance" RWL tires, have no such belt to avoid catastrophic belt and tread separation in an aged or poorly-maintained tire. Not a good idea to drive hard on "old" tires.