From the Knitshop website:

Our sock-weight yarn is a blend of 80% soft wool and 20% strong ramie fibre for hard-wearing foot gear.

Recommended needle size: 3-4mm
Tension: 22-30st / 10cm (4inches)
Hank: approx. 300m / 100g
Hand-wash

Ramie is a bast fibre, from an East Asian flowering plant in the nettle family, one of the oldest fibre crops in the world. It gives strength and stability to our sock yarn for flexible long life.