Unlike Peter, I cut these to fit my S7s and they failed to impress. It's true: they save a few ounces for the climb, the fold and pack more easily, and in some cases they seem to have a little bit more glide. That said, those few onces saved translate into greatly decresed climbing performance on steeper tracks. They climb just fine if you're cutting mellow switchbacks to-and-fro, but if you're skinning a ridge with steeper steps then you're in for a time. I'm switching back to the normal STS skins, which have done the trick for years.