Nike SB Chron 2 Skate Shoes THE NEXT GENERATION OF CHRON. Flexible and breathable, the Nike SB Chron 2 is a sequel worthy of its predecessor. The revamped design includes a reshaped collar and heel for an improved fit—all while maintaining the comfort and performance you expect from Nike SB. Suede and canvas are durable and breathable. Foam cushions every step. Vulcanized construction fuses the sole to the upper for a flexible feel. Extended toe bumper adds durability.