SweetGeorgia Superwash DK, MadelineTosh Tosh DK, and Cascade 220 superwash.
The mitts are knit in a simple 2x2 ribbing (including the thumb) so they have a great deal of stretch and will fit most hands.
You will need one skein of DK or light worsted weight yarn for these mitts. Look for a wool yarn with about 220 to 260 yards per 100 grams. Small differences in gauge will not substantially affect the fit of these mitts.
In addition to yarn, you will need knitting needles to knit in the round. I used 2 circulars for these mitts, but the pattern does not depend on this and you may choose the circular method of your choice. You will also need markers and a tapestry needle.
There are pointers to the cast on, bind off and purl side M1 on my resources page.
The pattern is available for free at Morristown Mitts.
Photos copyright Prairie Willow Knits..