LEKI Thermolite XL AS The AERGON GRIP (air + ergonomics) is one of the pole innovations offered by Leki. The revolutionary~ edgeless outer shape can either be palmed or held traditionally. The extremely lightweight shell cavity construction makes the AERGON GRIP the lightest grip in Leki history. Includes integrated security wrist strap. Locking Security Strap (LSS): feature allows wrist strap to quickly release when pulled upwards. Automatic comfort straps: adjust without the use of a buckle for convenience. Less bulky~ silky soft~ wicking material is very comfortable~ breathable and quick-drying. Soft Antishock - Lite System (SAS-L): the Soft Antishock - Lite System is integrated into the lower shaft of the pole reducing the packing/swing size by 50mm and absorbs impact energy directly into the lower shaft. The ingenious combination of steel spring and soft elastomer provides precise synchronization between spring strength and compression making trekking with poles more comfortable than ever. The weight of the Antishock System is reduced by 20% and an ON/OFF function is no longer necessa SPEEDLOCK: (on upper section) utilizes direct compression force to lock the pole shafts into place. Touted as the most powerful external locking system in the world~ the SpeedLock utilizes an integrated stainless steel pressure plate that provides a vise-like clamp to hold the pole adjustment in place. The cam style lock is made of fiberglass reinforced polyamid. It can be opened and shut easily with one hand~ even when wearing gloves. Super Lock System (SLS) on bottom section) the strongest internal pole locking system available as tested and certified by TUV (International Compliance Management) &gt;140 kg per pole; secure adjustment hold with the least amount of torque (hand strength required) offers secure~ reliable support that is easy to use - just 3-6 twists; High locking back force with 360 "back turn security"