One size. Hand’s circumference for the mitt: from 20 to 23 cm.

The mitts are worked in the round beginning from the cuffs.
10 sts are put on sts holder for thumb opening and worked eventually once the mitt is finished.

For the bind off I used the Icelandic bind off which is recommended for the garter sts.

Stitch dictionary, instructions for bind off and pictures may be found at the end of the pattern.