From the Atomic website:
[Skin skis] were invented by Atomic a few years ago and more and more people are falling in love with them. Like Emil and Johann: “Skin skis are super easy to handle and always ready to use.” They are waxless classic skis with a mohair insert in the kick zone. The mohair has a nap, so it glides in one direction and provides grip in the other.
Skin skis work in a wide range of conditions. “My whole family has been skiing on Atomic Skintec skis for a whole season and they worked great in every snow and temperature. The grip is excellent, the glide is excellent, and they go fast. You still have to glide wax them periodically, but they are ideal “grab and go” classic skis and a pleasure to ski on” affirms Emil.