This pattern is made with three yarn suggestions depending on what size you want.
The actual design is not particularly difficult.

If you want a male mitten you should choose cashmere queen from schoppelwolle, a fantasticly soft but not as elastic yarn. For a medium mitten you can choose a yarn as Marks & Kattens ECO baby wool. And finally if you want a small mitten you can choose Schoppelwolle Admiral, a thin but really nice yarn.
If there is something about the pattern that you are wondering about, dont hesitate to ask.