I ride a Honda crf450r and these grips are the only ones that reduce arm pump for me.
Renthal Dual Series combine the durability of the Renthal firm compound grips with the feel and absorption of the soft compound. Maximum durability is achieved by using the Renthal firm compound for the inner sections of the grip whilst rider contact areas uses the KevlarŪ brand compound providing unbeatable comfort and control.
Renthal has developed a special reinforced grip made with increased wear resistance. The grip has all the properties you would expect from a Renthal grip but with the life extending properties of KEVLARŪ brand resin. The base material contains millions of randomly aligned KEVLARŪ brand resin particles. As the grip is used more particles are exposed, so the number of particles at the grip surface increases.