Straight from the Shetland islands in northern Scottland, this yarn is celebrated for its ability to melt into beautiful colorwork motifs.
From Jamieson & Smith:
"Our Jumper weight yarns are 100% Shetland wool and are traditionally used in the knitting of Fair Isle garments. Available in the full pallette of beautiful shades originally designed by Jamieson and Smith, this yarn is our flagship yarn, and cannot be imitated in terms of depth of colour and spinning quality - although many have tried! 2ply refers to the plys in the yarn, this wool is a 4ply Woollen Spun thickness."
Check out Gudrun Johnston's book of patterns "The Shetland Trader - Book 3" with some beautiful designs utilizing Jamieson and Smith.