Dozens of in area laps have proved these to be light enough for a quick ascent and fun in just about any downhill conditions. They don't float like a dedicated powder ski, but they carve well and have some rebound to them. I matched them with a Salomon binding and enjoy having the brakes when I'm not going for max speed. You could race on these, but they aren't quite as quick as a dedicated race board.
This Salomon ski is purpose-built for uphill fitness. It is very light at under 1,000 grams and yet not as squirrely as a race ski. Nice dimensional shape for stability and turnability. Soft and flexy for your easy turns. Not a high speed demon for the downhill, but a great ski for uphill that is forgiving and soft for the downhill. I liken this ski to a Nike trainer; light, not too fast and really friendly. It really is the perfect ski for the older or inexperienced person who wants to uphill for fitness and go at a cruiser pace on the down hill.
I picked up the S/LAB X-Alp skis because i needed a fitness training ski that I could use at my local resort. I wanted something with better ski ability and overall downhill performance than my 65mm underfoot race ski. With the S/Lab X-Alp I have a wicked light ski I can hammer uphill with, and I can enjoy the descent more - these handle awesome in powder, packed power, crust and ice. The edge hold is really something, and I feel confident at speeds. I also use these skis in the spring when I'm ticking off mountaineering objectives - they handle really well on steep, committing terrain. Overall, highly recommended!