Woolstok Light from Blue Sky Fibers. 100% Fine Highland Wool. 200m (218yds) / 50g.

A fabulous 4 ply/Fingering weight yarn, gorgeous for colour work and for a 'woolly' but soft and light knit. 
The recommended needle range is 3-5 us/3.25-3.75 mm (but with such wonderful yarn, try going up a few needle sizes and see the effect!).