HIGH-QUALITY ULTRA DURABLE ROLLER SKATES - These quad roller skates are man-made using a vinyl material that gives a breathable, durable skate boot. The skates have a high-impact die cast aluminum ...

While this roller speed-skating competition was originally ... Players wear four-wheeled "quad" roller skates and mandatory protective equipment, including a helmet, mouth and wrist guards and ...

The skater drives the toe pick of the skate blade into the ice ... To complete a quad jump, skaters must have a rotation speed around 350 rpm. Nathan Chen has a rotation speed near 440 rotations ...