The Radical FLX is designed to create the most efficient skating stride available. The Klop-like frame found on the FLX allows skaters to utilize more muscle groups when skating then ever before, creating less fatigue and allowing you to skate for hours. The Radical FLX "features our Radical FLX frame", ILQ-9 bearing and is topped off with our medal winning Carbon Radical Cuff. Don’t forget to breathe.