The Ergon GE1 EVO Slim Lock On Grips are the evolution of the original GE1 Slim grips. The EVO takes things even further by increasing the grip available and reducing the amount of strength required to hold onto the bars, reducing the risks of arm pump or numbness in the hands. Ergon has achieved this by adjusting the texture of the grip against the direction of hand rotation so your hands will almost feel like they are screwing onto the grip.