LEKI Nordic Walking Instructor Trekking Pole Nordic Trigger grip / strap: LEKI's adjustable, releasable Trigger Energy+30 strap offers superior support Super Lock System (SLS): the strongest pole locking system available as tested by TUV, secure adjustment hold with the least amount of torque Rubber Fitness Lite tips: specifically designed to provide traction needed for Nordic Walking technique on pavement and smooth surfaces. Carbide Flextips: concave, cylindrical tips offer secure hold when Nordic Walking off road. Sizing - fully adjustable size range of 100 - 135cm fits walkers of all sizes and ages Smaller, compact tip size reduces weight at end of pole, enhances swing weight. All terrain and surfaces; Carbide is extremely hard and durable; entire tip ferrule (Flextip) is replaceable.