Simple fingerless mitts which can be rolled up or released for slightly colder weather

Materials: Cotton Merino by Drops (1 skein, I have used color #22), circular needles #3.5, scrap yarn

NOTE:
There’s a typo in a pattern:
Thumb > Row 2 – knit 17 stitches, 2 stitches in the gap – knit together, total number of stitches = 11
Total nuber of stitches should be 18, not 11