LEKI Thermolite Aergon XL Anti-shock Trekking Pole High-quality trekking pole made of high-grade aluminum Small-diameter, thin-wall tubing is treated with heat tempering process Super-Lock System makes it easy to adjust pole length while preserving "hold" Antishock system cushions impact of pole plant; ergonomic 15-degree grips Adjustable from 26.7 to 57 inches long; weighs 17 ounces; lifetime shaft warranty