Cascade 220 is a great all-purpose worsted weight yarn.  It comes in a wide range of colours in Solids, Heathers, and Marls.  The yarn has excellent stitch definition, is sturdy enough for mittens or hats, yet still soft enough for a sweater. 

Composition: 100% Wool 

Gauge: 18-20 stitches/4"

Recommended Needle Size: 4.5-5 mm / US 7-8

Weight: Worsted

Size: 100g/200m

Care: Hand wash, lay flat to dry

100% Peruvian Wool

100g/3.5 oz

220 yards/200 meters

18-20 stitches = 4" (10 cm)

US 7-8 (4.5 - 5 mm)