The Leki Super Makalu COR-TEC PA Antishock Trekking Poles are designed for rugged mountian trekking and extreme comfort. Made from 3 telescoping sections of durable, lightweight aluminum covered by a lifetime warranty for shaft breakage. These poles weigh in at 21.0 oz for the pair, and are adjustable from 68-145cm. No matter which length you dial in the Super Makalu Ergometric AS Trekking Poles will help to distribute up to 25 percent of the effort to your upper body so you experience improved stability and less stress to your knees and back. If you are looking for trekking poles that are as rugged as the terrain you travel the Leki Super Makalu Ergometric AS Trekking Poles are going to amaze you with strength and comfort.