Adriafil Terna - a blend of cotton, linen and viscose. This cardigan pattern (free if you want it) takes from 9/10/10/11 balls for S/M/L/XL.
Patterns for Rowan's Softyak DK will also suit this yarn.
Meterage: 137 yards (125 meters)
Unit weight: 50 grams (1.76 ounces)
Gauge: 22 sts x 33 rows = 4 inches
Needle/hook size: 4mm
Fibers: 60% Cotton / 30% Viscose / 10% Linen