The PRC 850 TR is a top cross-country ski pole for ambitious recreational athletes. It is equipped with the new Nordic Shark, a grip/strap technology designed entirely for cross-country skiing. The grip guarantees the best connection between hand and pole and provides precision guidance, control and power transmission. The Shark Loop lets you easily click in and out in seconds and the Quick Release Button makes it even easier than ever. The adjustable Speed Shape provides precise control over the poles for quick movements. The Fin Vario interchangeable basket system lets you change the tip and the basket to match the trail conditions and can also be converted for summer training. Grip ships detached for easy custom sizing. NOTE: NOT compatible with Alpine Trigger gloves. Only compatible with Cross Country Gloves .