[Foldable System Design]- Nordic walking poles can reduce the impact to ankles and knees by as much as 30%. Whether hiking for a day or a week, this poles will help your endurance and balance.S:Walking poles is provided with unique and easy to use folding system. They can extend your poles from 95cm to 110cm quickly. L:Walking poles is provided with unique and easy to use folding system. They can extend your poles from 110cm to 130cm quickly. The height of the poles has adjustment range of 20cm. Choose the sizes that best fit you. [7075 Aluminum Alloy]- Changshengda trekking poles collapsible made with aircraft grade 7075 aluminum-crucial, which withstands pressure and impacts better than carbon. A surface treatment creates a protective coating against corrosion and changes the surface structure, which improves the corrosion resistance. [Ergonomic EVA Foam Design]- The Ergonomic EVA Foam Handle with wrist strap, sweat-absorbent, skid resistance groove design, more sturdy and comfortable than cork handle. Our wrist straps are adjustable, they can let you relax your grip slightly and transfer some of the pressure to your arm. [Compact & Lightweight Design]- When you not in use, these are easy to folding down to less than 35cm to be stored in your backpack, Changshengda walking sticks are the perfect gift for outdoor hikers who enjoy light and compact gear