This is a woollen spun DK weight yarn with 3 plies. It is 24 micron with a very soft handle.
2015 update: the new season’s wool has an added twist in the singles to make it more robust without losing too much softness
2016: Being woollen spun, the yarn traps air, so is suited to lightweight yet warm garments with a rustic look
2018 update: The colour range has been changed to the six colours in the pic above