FEATURES: Air Guard(TM) technology provides a protective layer with increased strength and extra puncture resistance Showcases a carbon steel bead for extra safety, and tire strength Extremely durable and built to stand up to the elements Designed for a smooth ride the knobby tread design of this bike tire provides superior traction with excellent grip Conveniently, these tires fold and unfold without damage, making them easy to transport from place to place Ultra-durable Air Guard(TM) Technology is a protective layer inside the tire that provides 30% more strength and extra puncture resistance* and helps protect against flats