LEKI Summit AS AERGON COR-TEC grips ergonomic design specifically created for trekking; 80% natural, ground cork/rubber combination for comfort, breathability, and durability; ergonomic design for control and support .Edgeless outer shape offers a variety of comfortable, secure gripping options. Biotec 2 lightweight shell cavity. 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 .Lined with a soft, quick drying wicking material for comfort. Integrated Positive Angle: 10-degree angle incorporated into the handle keeps wrist in neutral position during pole plants, reducing strain; Allows for minimal packing/stowing size. Optimized swing weight. Super Lock System (SLS): the strongest 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"