Two years of development for a specific goal: reduce the fatigue of the hands and arms. The XL V2.1 SLR are the latest arrivals of the Lock-on V2.1 knobs line and have been specially designed to reduce the impacts and vibrations transmitted to the hands and therefore to pedal even longer with less effort. - angled waffle in the lower part that follows the articulation of the fingers to climb control and ergonomics Two Years of Development for a very specific Goal: To Reduce Hand and Arm Fatigue. The reflex xl v2.1 are the latest addition to the v2.1 line of lock-on grips and have been specially designed to return impacts and vibrations transmitted to the hands and therefore to pedal even with less less fatigue. - Angled Waffle in the Lower Part That Follow The Finger Joint to Incase Co.