LEKI Thermolite Trekking Pole Ultralite shafts: small diameter (16/14/12mm), 7075 heat-treated shafts LEKI's new grip shape and design incorporates the Positive Angle INTO the grip Super Lock System (SLS): the strongest pole locking system available as tested by TUV Soft Antishock System Lite (SAS-L): internal suspension system cushions Carbide Flextips: concave, cylindrical tips offer secure hold on all terrain and surfaces