Whether you're looking to hit V02 max, or just refining your technique, the Delta Skating NIS Ski is possibly the most versatile option in the Rossignol cross country arsenal. It's built with a larger sweet spot than Rossignol's hardcore X IUM race series, making it easier to improve on your technique. Instead of using a carbon laminate, the Delta utilizes a friendlier, and more forgiving, fiberglass laminate for a softer feel. A friendly flex doesn't come at the expense of speed, though, as the Delta comes with the same K7000 base tuning you'll find on the World Cup ready X IUM and a lower, shorter tip tip to reduce vibration and improve maneuverability, so you can hammer hills and step turns without feeling as tippy as a one legged chair.In addition to the fiberglass laminate, the Delta uses Rossignol's lightweight Honeycomb core with an Activ'Cap construction, keeping the ski stiff enough to power up hills and over flats, while maintaining softer tips and tails to cruise over uneven snow. The Delta is marginally heavier by 30g than the Delta Course, a difference barely more than the weight of a pencil, and it has a Racing Cobra sidecut that's slightly wider in the tip to keep the ski moving in the direction of travel when on edge. When it's running flat, double guide grooves on the base keep it tracking forward, and an integrated NIS plate allows drill free binding mounting and adjustment.