On Sale. Grivel Tech Leash Fall 2009 The Tech Leash by Grivel is perfect for all of Grivels ice axes, from classical models to the most technical, from Nepal to Monster and the brand new Matrix. The part with the ring is attached to the ice axes head and the easy toggle system lets you hook up and release with just one simple hand movement. A natural rubber sling gives comfortable support to the wrist and the climbers weight. Wrist sizes and length are easily adjustable with just one strap.