Continental Gator Hardshell Urban Bicycle Tire With Duraskin (700X23, Folding) delete High Definition Optics (HDO) is

High Definition Optics (HDO) is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity

It's designed to fit your Giro Aeorhead helmet and has an internal zippered compartment for your visor

strengthen and tone muscles

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Continental Gator Hardshell Urban Bicycle Tire With Duraskin (700X23, Folding) delete High Definition Optics (HDO) isContinental 0100311 Gator Hardshell 700 x 23 Foldable Urban Tire with Duraskin has set the bar for a perfectly balanced blend of ride quality and long term durability without breaking the bankbut still the roads of North America demand a model even tougher. The all new Gator Hardshell delivers! Sharing the bead to bead protection of Duraskin, the Hardshell casing wraps further into the sidewall and an extra wide Poly X breaker covers the entire tread