Black Diamond Contour Elliptic Shock Trekking Poles (2012) The comfort of Control Shock Technology combined with the stability of our elliptic shaft shape makes for a deluxe trekking pole Dual-density grip top, 360-degree Nubuck strap and foam extension Control Shock Technology for smooth shock absorption and Double FlickLocks Elliptic shape for ergonomic comfort and strength Interchangeable carbide Tech Tips and low-profile trekking baskets